[Tsan] Make the mutex_robust tests Linux-specific
Differential Revision: http://reviews.llvm.org/D5729


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@219790 91177308-0d34-0410-b5e6-96231b3b80d8
[Tsan] Fix the sunrpc.cc test to build on FreeBSD
Differential Revision: http://reviews.llvm.org/D5730


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@219791 91177308-0d34-0410-b5e6-96231b3b80d8