Handle LLDB_LIB_DIR on FreeBSD as on Linux

Diagnosed and tested by Mike Ma.
http://llvm.org/pr18191


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@199549 91177308-0d34-0410-b5e6-96231b3b80d8
Add decorator for FreeBSD test failure pr18522


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@199550 91177308-0d34-0410-b5e6-96231b3b80d8