Add Mac OS X C, C++, Objective-C, and Objective-C++ support (from @caodingpeng)

Add utility code so we can pull in @caodingpeng's Mac OS X File Based C runners.
I use `git shortlog -sne` to get these. The only one I'm trimming is `dev <dev@debian7devel>`. That's the result of someone committing from a specific Debian virtual machine setup...