timespec_get (posix): Fix copyright header

  The “any later version” clause was missing.  This change was approved
in principle by the FSF in RT ticket #1316403.

2018-12-12  Florian Weimer  <fweimer@redhat.com>

	* sysdeps/posix/timespec_get.c: Add missing “any later version”
	clause to copyright header.
  

On 12/12/18 5:55 AM, Florian Weimer wrote:
> The “any later version” clause was missing.  This change was approved
> in principle by the FSF in RT ticket #1316403.
> 
> 2018-12-12  Florian Weimer  <fweimer@redhat.com>
> 
> 	* sysdeps/posix/timespec_get.c: Add missing “any later version”
> 	clause to copyright header.
> 
> diff --git a/sysdeps/posix/timespec_get.c b/sysdeps/posix/timespec_get.c
> index 6a40b64b8c..18fd0f1b9f 100644
> --- a/sysdeps/posix/timespec_get.c
> +++ b/sysdeps/posix/timespec_get.c
> @@ -5,7 +5,7 @@
>     The GNU C Library is free software; you can redistribute it and/or
>     modify it under the terms of the GNU Lesser General Public
>     License as published by the Free Software Foundation; either
> -   version 2.1 of the License.
> +   version 2.1 of the License, or (at your option) any later version.
>  
>     The GNU C Library is distributed in the hope that it will be useful,
>     but WITHOUT ANY WARRANTY; without even the implied warranty of
> 

OK for master.

I have seen the ticket and the approval by the FSF licensing and compliance
manager. Their exact wording was "Yes, please do correct the license header."
Therefore as a GNU Package maintainer I approve this change.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>