Redefine Datum as uintptr_t, instead of unsigned long.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 85d02a6586012edc385a420ebaca1c8ce4e93390
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2009-12-31T19:41:37Z
Releases: 9.0.0
Redefine Datum as uintptr_t, instead of unsigned long.

This is more in keeping with modern practice, and is a first step towards
porting to Win64 (which has sizeof(pointer) > sizeof(long)).

Tsutomu Yamada, Magnus Hagander, Tom Lane

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