winmm: Avoid casting return value of Heap(Re)Alloc calls.

[Dan Kegel]

On Sun, Oct 23, 2011 at 3:18 PM, Austin English <austinenglish at gmail.com> wrote:
> This has come up a few times before, and it's already been discussed,
> -Werror will not go in by default.

Well, yes, several times, but I wasn't sure if that
was a "never under any circumstances",
or if the objections could be picked off one by one.
Evidently it's the former.

But that's ok, that's what buildbot is for, and there aren't
that many new wine developers stubbing their toes on
this at any one time.