Update hash and join routines to use fd.c's new temp-file

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

Commit: 71d5d95376fb9b675a191c128e6c5e5ff3940f78
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 1999-05-09T00:53:22Z
Releases: 7.1.1
Update hash and join routines to use fd.c's new temp-file
code, instead of not-very-bulletproof stuff they had before.

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