Add casts to suppress compiler warnings observed on Darwin platform

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

Commit: 64af43a15f97162aa4b5a4cbdaa10f3721adf996
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2001-11-08T04:05:13Z
Releases: 7.2.1
Add casts to suppress compiler warnings observed on Darwin platform
(surprised no one has reported these yet...)

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