[Geany] Adding an a second extension for filetype

[Enrico Troeger]

Hi Kevin,

> I found this in the gcc manpage. It shows all the the
> recognized c++ extension.  Don't worry about this
> issue if it actually takes coding on your.  I was just
> hoping there might be a way to edit the config file to
> get "*.C" recognized as c++ code.
I added the extension to the C++ filetype and in a few hours it should
be available via CVS.

Probably in the future it will be possible to change the file
extensions. But surely not in the next release ;-)

regards,
Enrico