Use max_align_t from <stddef.h>

[Florian Weimer]

On 10/28/2015 06:06 PM, Joseph Myers wrote:

> 2015-10-28  Joseph Myers  <joseph@codesourcery.com>
> 
> 	* include/libc-internal.h (libc_max_align_t): Remove typedef.
> 	* include/scratch_buffer.h: Include <stddef.h> instead of
> 	<libc-internal.h>.
> 	(struct scratch_buffer): Use max_align_t instead of
> 	libc_max_align_t.

OK.

Florian