C99 introduced additional conversion specifiers for use with the printf and
scanf family of functions. Specifically, the 'z' size specifier for size_t
values and the 't' size specifier for ptrdiff_t values. Historically, we have
not used them because the C99 support in a certain C compiler was lacking.
Since this is no longer the case, use them. This removes the need of a bunch
of casts, some of which were incorrect on 64-bit Windows.
runtime/mercury_accurate_gc.c:
runtime/mercury_memory_zones.c:
runtime/mercury_stacks.c:
runtime/mercury_wrapper.c:
As above.
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