opus - Jul 2016 - Check for alloca() in <malloc.h> as well as <alloca.h>

On the IRC channel, RiCON mentioned the patch
https://github.com/Alexpux/MINGW-packages/blob/master/mingw-w64-opus/0001-correctly-detect-alloca.mingw.patch
, which apparently is necessary on MinGW.

That patch had the disadvantage of breaking platforms that have <alloca.h>
but not <malloc.h>.  The attached patch should handle either case.
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