[patch, fortran] Support .F03 and .f03 file extensions

[FX Coudert]

>> 2007-01-06  Tobias Burnus  <burnus@net-b.de>
>>
>>     * lang-specs.h: Add support for .f03 and .F03 extensions.
>>     * gfortran.texi: Document .f03 extension.
>>     * options.c (form_from_filename): Recognize .f03.

Didn't I approve that already? I'm sorry, I really thought I had  
given you the green light already :(

OK to commit to mainline. Probably worth a backport to 4.2.

>> -@command{gcc} will recognize files with @file{.f}, @file{.f90}, and
>> -@file{.f95} extensions as Fortran source code, and compile it
>> +@command{gcc} will recognize files with @file{.f}, @file{.f90},  
>> @file{.f95},
>> +and @file{.f03} extensions as Fortran source code, and compile it

I think it should be noted that the capital file suffices not being  
documented at this very same point of the documentation looks weird  
to me. Maybe something to look into in the future?

FX