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)