ntdll: add partial support for HEAP_FREE_CHECKING_ENABLED heap overrun detection (take 2)

[Dan Kegel]

This patch just fills the padding region, it doesn't validate it
at all (unless you're running valgrind).  Validation will
come in a later patch once Alexandre reviews this one.

Other changes since first posted:
- use right type for loop variable
- don't cast pointer to int
- move tests to kernel32/tests/heap.c
- create separate heap so wine developers don't need to enable heap
debugging on default heap

Tests pass on Wine and Vista.  Valgrind seems happy with it, too.
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