pgsql: Add more dependencies from libpgport required by standalone msvc

Log Message:
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Add more dependencies from libpgport required by
standalone msvc build of libpq.

Hiroshi Saito

Tags:
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REL8_3_STABLE

Modified Files:
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pgsql/src/interfaces/libpq:
win32.mak (r1.50 -> r1.50.2.1)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/libpq/win32.mak?r1=1.50&r2=1.50.2.1)