Log Message:
-----------
Mention libpq.rc.in is now the file to update for releases.
Modified Files:
--------------
pgsql/src/tools:
RELEASE_CHANGES (r1.51 -> r1.52)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/RELEASE_CHANGES.diff?r1=1.51&r2=1.52)