Have clang pay attention to the LIBRARY_PATH environment variable.

The LIBRARY_PATH environment variable should be honored by clang. Have the
driver pass the directories to the linker.
<rdar://problem/9743567> and PR10296.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152578 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed