Rename C files to .c in GCC source

[Oleg Endo]

On Sat, 2015-02-07 at 23:17 +0000, Jonny Grant wrote:
> On 03/02/15 23:20, Andreas Schwab wrote:
> > Jonny Grant <jg@jguk.org> writes:
> >
> >> How many minutes labor is this task?
> >
> > What does it fix?
> 
> Consistency. Less important if these files are only compiled after GCC 
> available, to use as a testsuite. Although I understood from other 
> replies that other files needed hacks to get them to compile.
> 
> However, if this suggestion isn't supported, there's no benefit of 
> discussing further.

This whole filename stuff has been discussed already a while ago:
https://gcc.gnu.org/ml/gcc/2012-08/msg00310.html

Cheers,
Oleg