Fix broken header guard.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@183873 91177308-0d34-0410-b5e6-96231b3b80d8
[LSan] fix link flags for building unit tests

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@183891 91177308-0d34-0410-b5e6-96231b3b80d8