systemd-bootchart: Disable LTO to fix reproducibility

LTO likely doesn't buy us much here, disable it to allow the binaries
to be reproducible.

(From OE-Core rev: b4b5e52b5bd98deb0855700e4aae6228d52e5a83)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/selftest/cases/reproducible.py

@@ -42,8 +42,7 @@ exclude_packages = [
 	'perf',
 	'python3-cython',
 	'qemu',
-	'ruby-ri-docs',
-	'systemd-bootchart'
+	'ruby-ri-docs'
 	]
 
 def is_excluded(package):

meta/recipes-devtools/systemd-bootchart/systemd-bootchart/no_lto.patch

@@ -0,0 +1,19 @@
+LTO output is not reproducible. Until it is, disable this. Sadly
+there is no configuration option to do so at this time.
+
+Upstream-Status: Pending [may be accept addition of configuration option?]
+RP 2021/3/1
+
+Index: git/configure.ac
+===================================================================
+--- git.orig/configure.ac
++++ git/configure.ac
+@@ -124,7 +124,7 @@ AS_CASE([$CC], [*clang*],
+ 
+ AS_CASE([$CFLAGS], [*-O[[12345sz\ ]]*],
+         [CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\
+-               -flto -ffat-lto-objects])],
++               ])],
+         [AC_MSG_RESULT([skipping -flto, optimization not enabled])])
+ AC_SUBST([OUR_CFLAGS], "$with_cflags $sanitizer_cflags")
+ 

meta/recipes-devtools/systemd-bootchart/systemd-bootchart_234.bb

@@ -11,6 +11,7 @@ LIC_FILES_CHKSUM = "file://LICENSE.LGPL2.1;md5=4fbd65380cdd255951079008b364516c
 SRC_URI = "git://github.com/systemd/systemd-bootchart.git;protocol=https \
            file://0001-architecture-Recognise-RISCV-32-RISCV-64.patch \
            file://mips64.patch \
+           file://no_lto.patch \
 "
 
 SRC_URI_append_libc-musl = " \