Mark LLDB/CLANG_BOOTSTRAP/LLD_BOOTSTRAP as broken on non-FreeBSD for now

I enabled these options again in 31ba4ce8898f9dfa5e7f054fdbc26e50a599a6e3,
but unfortunately only my specific build configuration worked whereas the
build with default options is still broken.

(cherry picked from commit d9f25575a29ff7c83f226349a10a37b9aaf75ad5)