Nick Wellnhofer d422b954be Fix pointer/int cast warnings on 64-bit Windows ...

On 64-bit Windows, `long` is 32 bits wide and can't hold a pointer.
Switch to ptrdiff_t instead which should be the same size as a pointer
on every somewhat sane platform without requiring C99 types like
intptr_t.

Fixes bug 788312.

Thanks to J. Peter Mugaas for the report and initial patch.

2017-10-09 13:47:49 +02:00

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