[patch, fortran] Generate C prototypes from Fortran code

[Thomas Koenig]

HI Paul,

> This reminds me of project that I once started to translate fortran
> into C using a similar option. I gave up in the end because I found it
> more convenient to use a tree dump and modify the declarations by
> hand. In respect of your query about suggestions, how about outputting
> non_interop array descriptors?

Hmm... definitely something to think about.  I predict the
imminent death of TS 29113 if we do that :-)

> Anyway, it looks good to me - OK for trunk.

Thanks - committed as r250791.

Regards

	Thomas