[test] Unbreak OpenMP/linking.c with arch-specific libdir
[test] Unbreak OpenMP/linking.c with arch-specific libdir

After rL296927, -rpath gets added after linking the OpenMP runtime.
That's why -lgcc does not immediately follow -lomp or -lgomp.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@297264 91177308-0d34-0410-b5e6-96231b3b80d8

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