[PATCH] wordexp: Rewrite parse_tilde to use struct scratch_buffer [BZ #18023]

[DJ Delorie]

fweimer@redhat.com (Florian Weimer) writes:
> 2018-06-26  Florian Weimer  <fweimer@redhat.com>
>
> 	[BZ #18023]
> 	* posix/wordexp.c (parse_tilde): Use struct scratch_buffer
> 	instead of extend_alloca.

LGTM.