Fix deprecation warnings on OSX
Fix deprecation warnings on OSX

Silence a lot of these:
clang: warning: treating 'c' input as 'c++' when in C++ mode, this behavior is deprecated
clang: warning: treating 'cpp-output' input as 'c++-cpp-output' when in C++ mode, this behavior is deprecated

rubenk/burp,rubenk/burp,rubenk/burp