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support using the CRT's malloc() family of functions instead of
the internal one when ithreads is enabled; allocate large blocks
using VirtualAlloc() since the Heap*() functions may only be tuned
for small allocations (from Doug Lankshear <dougl@ActiveState.com>)
pass -D_USE_MSVCRT_MEM_ALLOC via cflags to enable the CRT's malloc();
also see comments at the top of win32/vmem.h for other options that
can be set
p4raw-id: //depot/perl@14175