recipes-devtools/llvm/llvm_%.bbappend: fix the build of bpftrace ptest 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] https://github.com/kraj/meta-clang/commit/bf6c02a47fb2ffec735df6c7dd642432f3681337
[2] https://github.com/bpftrace/bpftrace/commit/6cc531e35cd3bf77aa2a30cef3e3481c9c53042e
[3] https://git.openembedded.org/openembedded-core/commit/?id=ec22bfa67f6f1766102501d4593ce29aafe8c166

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>

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