Change license of filenames.h to LGPL

[Eli Zaretskii]

> From: DJ Delorie <dj@redhat.com>
> Cc: gcc-patches@gcc.gnu.org, sezeroz@gmail.com
> Date: Tue, 27 Sep 2016 15:00:46 -0400
> 
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> > Because Ozkan wants to use it in an otherwise LGPL package.
> 
> Ok, but that doesn't say why it's different.  That reason could apply to
> any header in there.  Do we need to convert all headers there to LGPL?

I understand that Ozkan only needs that one.  Ozkan?

> Is this "otherwise LGPL package" in one of our repos, or elsewhere?  Is
> he aware that filenames.h includes hashtab.h, which is GPL?
> 
> (I'm not opposed to the change, just trying to make sure I understand
> it's scope)

I'll let Ozkan answer these questions.  But if someone wants to know
which libraries need that, one of them is this:

  http://libtimidity.sourceforge.net/