plpsm - plpgpsm: enum type support merge

Log Message:
-----------
enum type support merge http://archives.postgresql.org/pgsql-committers/2007-04/msg00006.php

Modified Files:
--------------
plpgpsm/src:
pl_comp.c (r1.21 -> r1.22)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plpsm/plpgpsm/src/pl_comp.c.diff?r1=1.21&r2=1.22)
pl_exec.c (r1.54 -> r1.55)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plpsm/plpgpsm/src/pl_exec.c.diff?r1=1.54&r2=1.55)
pl_handler.c (r1.7 -> r1.8)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plpsm/plpgpsm/src/pl_handler.c.diff?r1=1.7&r2=1.8)