pgsql: Use Min() instead of min() in qsort, for consistency and to avoid

Log Message:
-----------
Use Min() instead of min() in qsort, for consistency and to avoid
redefined-macro warnings on some platforms. Per gripe from Hiroshi Saito.

Modified Files:
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pgsql/src/port:
qsort.c (r1.10 -> r1.11)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/port/qsort.c.diff?r1=1.10&r2=1.11)
qsort_arg.c (r1.2 -> r1.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/port/qsort_arg.c.diff?r1=1.2&r2=1.3)