clang-cl: Don't pass /defaultlib to the linker
clang-cl: Don't pass /defaultlib to the linker

Since r187945, clang-cl will add the runtime library dependency to
the .obj file.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@188086 91177308-0d34-0410-b5e6-96231b3b80d8

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