Change license of filenames.h to LGPL

[Ozkan Sezer]

On 9/28/16, Eli Zaretskii <eliz@gnu.org> wrote:
>> From: Alexandre Oliva <aoliva@redhat.com>
>> Cc: gcc-patches@gcc.gnu.org
>> Date: Wed, 28 Sep 2016 16:03:02 -0300
>>
>> Does that work for everyone involved?
>
> Except that no one will reimburse me for the time I wasted talking to
> several people, with eventually null result...
>

FWIW, you have my thanks for at least helping my case.