spirv-llvm-translator: small recipe cleanup

- There is no need for python3native, as this recipe doesn't depend on
  other python modules.

- Inherit lib_package so the llvm-spirv binary is in a separate package
  to the libLLVMSPIRVLib.so library.

- Remove obsolete CMake options that no longer appear to be required.

- Change CMAKE_SKIP_RPATH to CMAKE_SKIP_BUILD_RPATH as this stops the
  ELF editing on install without potentially removing any explicit
  RPATHs, and aligns with a change I've proposed for cmake.bbclass.

(From OE-Core rev: 0e371176b99c8fe73059d06708141c7b25b7d91c)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-graphics/spir/spirv-llvm-translator_21.1.0.bb

@@ -15,19 +15,12 @@ UPSTREAM_CHECK_GITTAGREGEX = "v(?P<pver>\d+(\.\d+)+)"
 
 DEPENDS = "llvm spirv-tools spirv-headers"
 
-inherit cmake pkgconfig python3native
+inherit cmake pkgconfig lib_package
 
-# Specify any options you want to pass to cmake using EXTRA_OECMAKE:
-# for CMAKE_SHARED_LIBS=OFF see https://github.com/KhronosGroup/SPIRV-LLVM-Translator/issues/1868
 EXTRA_OECMAKE = "\
     -DBASE_LLVM_VERSION='${@oe.utils.trim_version('${PV}', 3)}' \
+    -DCMAKE_SKIP_BUILD_RPATH=ON \
     -DBUILD_SHARED_LIBS=ON \
-    -DCMAKE_BUILD_TYPE=Release \
-    -DCMAKE_POSITION_INDEPENDENT_CODE=ON \
-    -DCMAKE_SKIP_RPATH=ON \
-    -DLLVM_EXTERNAL_LIT=lit \
-    -DLLVM_INCLUDE_TESTS=ON \
-    -Wno-dev \
     -DLLVM_EXTERNAL_SPIRV_HEADERS_SOURCE_DIR=${STAGING_INCDIR}/.. \
 "