Use XtUIntPtr for integer types that can hold pointers

Various Xt*Id types are integer types that are used to hold pointers.
Use uintptr_t for standards-compliant conversion and to support
architectures where long cannot hold pointers (e.g. CHERI).

I found these by compiling libXt with the CHERI Clang compiler, as it
warns about conversions from integer to pointer that do not use intptr_t.

Signed-off-by: Alex Richardson <Alexander.Richardson@cl.cam.ac.uk>

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