[Fortran, Patch] PR33862 - Support .ftn/.FTN file extension and use CPP for .FOR

[FX Coudert]

:REVIEWMAIL:

> 2007-10-27  Tobias Burnus  <burnus@net-b.de>
>
> 	PR fortran/33862
> 	* lang-specs.h: Support .ftn and .FTN extension, use CPP for .FOR.
> 	* options.c (form_from_filename): Support .ftn extension.
> 	* gfortran.texi: Document support of .for and .ftn file extension.

OK, thanks.