Mark two FreeBSD tests failing due to llvm.org/pr15989

After solving llvm.org/pr17226 these two tests now fail for the same reason
they do on Linux.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@194726 91177308-0d34-0410-b5e6-96231b3b80d8