Log Message:
-----------
Update location to download flex for building on Windows.
Modified Files:
--------------
pgsql/doc/src/sgml:
install-win32.sgml (r1.53 -> r1.54)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/install-win32.sgml?r1=1.53&r2=1.54)