Test linux only for absolute paths in the -fuse-ld option
Test linux only for absolute paths in the -fuse-ld option

Some target do not use this option and may emit a error message for
using it.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@367602 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang