Fix the apply_patches method to work correctly from the build-swift-cmake.py directory layout where llvm/clang/swift/lldb are all siblings of one another.
Fix the apply_patches method to work correctly from the
build-swift-cmake.py directory layout where llvm/clang/swift/lldb
are all siblings of one another.

apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb