Fix the build of bpftrace ptest failed

[hongxu-jia]

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

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[kraj]

lgtm

[kraj]

I had to revert this due to it causing check-layer to fail. meta-clang is yocto-compatible certified and we can not break that