[PATCH][testsuite] Use __SIZE_TYPE__ instead of unsigned long in malloc/memset prototype.

[DJ Delorie]

> I included removing the XFAILs as part of Anatoly's patch.  If these
> tests still fail with m32c then they need new comments about why
> they are XFAILed.

Thanks!  They failed because the malloc prototype didn't match the
builtin, so they should be fine now, unless that was masking some
other problem.