Try to match the linker being named ld.exe. Second try at fixing the windows bots.
Try to match the linker being named ld.exe. Second try at fixing the windows bots.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@150901 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang