recipes-devtools/llvm/llvm_%.bbappend: fix the build of bpftrace ptes…

…t failed

Due to commit [1][2], llvm-native was added to bpftrace to provide llvm-objcopy
for the ptest.

But because of commit [3], llvm-native requires opengl in DISTRO_FEATURES
to support libllvm.

In order to make the build of bpftrace ptest work, explicitly add libllvm to
PACKAGECONFIG for llvm-native if ptest enabled.

According to [2][3], bpftrace used llvm-objcopy to generate BTF data for unit tests,
regardless opengl in DISTRO_FEATURES, enable accelerated software renderer or not
does not have side effect on bpftrace

[1] kraj@bf6c02a
[2] bpftrace/bpftrace@6cc531e
[3] https://git.openembedded.org/openembedded-core/commit/?id=ec22bfa67f6f1766102501d4593ce29aafe8c166

Signed-off-by: Hongxu Jia <[email protected]>

recipes-devtools/llvm/llvm_%.bbappend

@@ -0,0 +1 @@
+PACKAGECONFIG:append:class-native = " ${@bb.utils.contains('PTEST_ENABLED', '1', 'libllvm', '', d)}"