Log Message:
-----------
Add documentation for Windows on how to set an environment variable.
Backpatch to 8.2.X.
Modified Files:
--------------
pgsql/doc/src/sgml:
libpq.sgml (r1.224 -> r1.225)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/libpq.sgml.diff?r1=1.224&r2=1.225)