ntdll: add missing valgrind hook in RtlAllocateHeap

[Dan Kegel]

Two chromium unit tests reported phony errors
when run on wine on valgrind because
RtlAllocateHeap sometimes returned an
allocation without notifying valgrind about it.

I suppose there might be a better way to do this
(i.e. shouldn't we be notifying valgrind about
NtAllocateVirtualMemory calls?),
but this works for now.

Fixes http://bugs.winehq.org/show_bug.cgi?id=18067
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