clang compiler warnings on autogenerated parser c-code

[Jochem Snuverink]

the clang compiler complains about the autogenerated parser c-code with:

clang: warning: treating 'c' input as 'c++' when in C++ mode, this behavior is deprecated

[Jochem Snuverink]

fix issue #48 : clang compiler warnings: rename parser output names to c++-extensions

→ <<cset 7209e7b34de7>>