provide an explicit base address for perl56.dll to avoid relocations;

provide an explicit base address for perl56.dll to avoid relocations;
increase the default stack size (RE engine can use a lot more stack
than the 1MB default limit); default to using the regular version of
the MSVCRT even for DEBUGGING builds (this allows extensions to be
selectively built with debugging)

p4raw-id: //depot/perl@5736