Include -lkrb5 when needed for shlibs depending on libpq. Per report

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

Commit: 979b5375227dac6c42c1e5b9557d9d698997e7d1
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2003-10-28T21:55:58Z
Releases: 7.4.1
Include -lkrb5 when needed for shlibs depending on libpq.  Per report
from Johan Henselmans.

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