qemu: fix target build with ccache enabled

* with ccache inheritted, the BUILD_CC is 'ccache gcc', but because of missing
  quote it ends passing just ccache to host-cc which gets stripped and then
  it calls compiler[0] on empty compiler variable and breaks meson as shown in:
  http://errors.yoctoproject.org/Errors/Details/751436/

python version: Python 3.12.1
Traceback (most recent call last):
  File "TOPDIR/tmp-glibc/work/core2-64-oe-linux/qemu/8.2.0/recipe-sysroot-native/usr/lib/python3.12/site-packages/mesonbuild/mesonmain.py", line 194, in run
    return options.run_func(options)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "TOPDIR/tmp-glibc/work/core2-64-oe-linux/qemu/8.2.0/recipe-sysroot-native/usr/lib/python3.12/site-packages/mesonbuild/msetup.py", line 358, in run
    app.generate()
  File "TOPDIR/tmp-glibc/work/core2-64-oe-linux/qemu/8.2.0/recipe-sysroot-native/usr/lib/python3.12/site-packages/mesonbuild/msetup.py", line 181, in generate
    return self._generate(env, capture, vslite_ctx)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "TOPDIR/tmp-glibc/work/core2-64-oe-linux/qemu/8.2.0/recipe-sysroot-native/usr/lib/python3.12/site-packages/mesonbuild/msetup.py", line 203, in _generate
    intr = interpreter.Interpreter(b, user_defined_options=user_defined_options)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "TOPDIR/tmp-glibc/work/core2-64-oe-linux/qemu/8.2.0/recipe-sysroot-native/usr/lib/python3.12/site-packages/mesonbuild/interpreter/interpreter.py", line 331, in __init__
    self.parse_project()
  File "TOPDIR/tmp-glibc/work/core2-64-oe-linux/qemu/8.2.0/recipe-sysroot-native/usr/lib/python3.12/site-packages/mesonbuild/interpreterbase/interpreterbase.py", line 132, in parse_project
    self.evaluate_codeblock(self.ast, end=1)
  File "TOPDIR/tmp-glibc/work/core2-64-oe-linux/qemu/8.2.0/recipe-sysroot-native/usr/lib/python3.12/site-packages/mesonbuild/interpreterbase/interpreterbase.py", line 198, in evaluate_codeblock
    raise e
  File "TOPDIR/tmp-glibc/work/core2-64-oe-linux/qemu/8.2.0/recipe-sysroot-native/usr/lib/python3.12/site-packages/mesonbuild/interpreterbase/interpreterbase.py", line 190, in evaluate_codeblock
    self.evaluate_statement(cur)
  File "TOPDIR/tmp-glibc/work/core2-64-oe-linux/qemu/8.2.0/recipe-sysroot-native/usr/lib/python3.12/site-packages/mesonbuild/interpreterbase/interpreterbase.py", line 204, in evaluate_statement
    return self.function_call(cur)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "TOPDIR/tmp-glibc/work/core2-64-oe-linux/qemu/8.2.0/recipe-sysroot-native/usr/lib/python3.12/site-packages/mesonbuild/interpreterbase/interpreterbase.py", line 530, in function_call
    res = func(node, func_args, kwargs)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "TOPDIR/tmp-glibc/work/core2-64-oe-linux/qemu/8.2.0/recipe-sysroot-native/usr/lib/python3.12/site-packages/mesonbuild/interpreterbase/decorators.py", line 260, in wrapper
    return f(*nargs, **wrapped_kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "TOPDIR/tmp-glibc/work/core2-64-oe-linux/qemu/8.2.0/recipe-sysroot-native/usr/lib/python3.12/site-packages/mesonbuild/interpreterbase/decorators.py", line 579, in wrapper
    return f(*wrapped_args, **wrapped_kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "TOPDIR/tmp-glibc/work/core2-64-oe-linux/qemu/8.2.0/recipe-sysroot-native/usr/lib/python3.12/site-packages/mesonbuild/interpreter/interpreter.py", line 1309, in func_project
    self.add_languages(proj_langs, False, MachineChoice.BUILD)
  File "TOPDIR/tmp-glibc/work/core2-64-oe-linux/qemu/8.2.0/recipe-sysroot-native/usr/lib/python3.12/site-packages/mesonbuild/interpreter/interpreter.py", line 1476, in add_languages
    success = self.add_languages_for(args, required, for_machine)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "TOPDIR/tmp-glibc/work/core2-64-oe-linux/qemu/8.2.0/recipe-sysroot-native/usr/lib/python3.12/site-packages/mesonbuild/interpreter/interpreter.py", line 1519, in add_languages_for
    comp = compilers.detect_compiler_for(self.environment, lang, for_machine, skip_sanity_check)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "TOPDIR/tmp-glibc/work/core2-64-oe-linux/qemu/8.2.0/recipe-sysroot-native/usr/lib/python3.12/site-packages/mesonbuild/compilers/detect.py", line 115, in detect_compiler_for
    comp = compiler_from_language(env, lang, for_machine)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "TOPDIR/tmp-glibc/work/core2-64-oe-linux/qemu/8.2.0/recipe-sysroot-native/usr/lib/python3.12/site-packages/mesonbuild/compilers/detect.py", line 112, in compiler_from_language
    return lang_map[lang](env, for_machine) if lang in lang_map else None
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "TOPDIR/tmp-glibc/work/core2-64-oe-linux/qemu/8.2.0/recipe-sysroot-native/usr/lib/python3.12/site-packages/mesonbuild/compilers/detect.py", line 614, in detect_c_compiler
    return _detect_c_or_cpp_compiler(env, 'c', for_machine)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "TOPDIR/tmp-glibc/work/core2-64-oe-linux/qemu/8.2.0/recipe-sysroot-native/usr/lib/python3.12/site-packages/mesonbuild/compilers/detect.py", line 286, in _detect_c_or_cpp_compiler
    compiler_name = os.path.basename(compiler[0])
                                     ~~~~~~~~^^^
IndexError: list index out of range

...

Project name: qemu
Project version: 8.2.0
C compiler for the host machine: ccache x86_64-oe-linux-clang -target x86_64-oe-linux -m64 -march=core2 -mtune=core2 -msse3 -mfpmath=sse -mlittle-endian --dyld-prefix=/usr -Qunused-arguments --sysroot=TOPDIR/tmp-glibc/work/core2-64-oe-linux/qemu/8.2.0/recipe-sysroot -m64 -mcx16 (clang 17.0.6 "clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)")
C linker for the host machine: x86_64-oe-linux-clang -target x86_64-oe-linux -m64 -march=core2 -mtune=core2 -msse3 -mfpmath=sse -mlittle-endian --dyld-prefix=/usr -Qunused-arguments --sysroot=TOPDIR/tmp-glibc/work/core2-64-oe-linux/qemu/8.2.0/recipe-sysroot -m64 -mcx16 ld.lld 17.0.6

../qemu-8.2.0/meson.build:1:0: ERROR: Unhandled python exception

    This is a Meson bug and should be reported!

ERROR: meson setup failed

(From OE-Core rev: 7e55102cff9ddecb4f0acbb3bcafa703dd9808fd)

Signed-off-by: Martin Jansa <martin.jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/qemu/qemu.inc

@@ -114,7 +114,7 @@ EXTRA_OECONF = " \
     --extra-ldflags='${LDFLAGS}' \
     --disable-download \
     --disable-docs \
-    --host-cc=${BUILD_CC} \
+    --host-cc='${BUILD_CC}' \
     ${PACKAGECONFIG_CONFARGS} \
     "