[compiler-rt] [sanitizer_common] mark __elf_aux_vector as weak on FreeBSD (PR #118110)

[Dimitry Andric via llvm-commits]

DimitryAndric wrote:

Note that we have had this change in the FreeBSD tree since freebsd/freebsd-src at 8b181c2fbaa8c6b32e5510ef6e3a6d364ff4710e, but I had forgotten to upstream it.


https://github.com/llvm/llvm-project/pull/118110