pgsql: Set Win32 server-size socket buffer to 32k, for performance

Log Message:
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Set Win32 server-size socket buffer to 32k, for performance reasons.

Yoshiyuki Asaba

Modified Files:
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pgsql/src/backend/libpq:
pqcomm.c (r1.186 -> r1.187)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/libpq/pqcomm.c.diff?r1=1.186&r2=1.187)