Swap SWIFT_LIBDIR_SUFFIX to LLBUILD_LIBDIR_SUFFIX
Swap SWIFT_LIBDIR_SUFFIX to LLBUILD_LIBDIR_SUFFIX

apple/swift-llbuild,apple/swift-llbuild,apple/swift-llbuild,apple/swift-llbuild,apple/swift-llbuild,apple/swift-llbuild,apple/swift-llbuild