plpsm - plpgpsm: merge patch

Log Message:
-----------
merge patch http://archives.postgresql.org/pgsql-committers/2007-03/msg00136.php

Modified Files:
--------------
plpgpsm/src:
Makefile (r1.10 -> r1.11)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plpsm/plpgpsm/src/Makefile.diff?r1=1.10&r2=1.11)
gram.y (r1.51 -> r1.52)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plpsm/plpgpsm/src/gram.y.diff?r1=1.51&r2=1.52)
pl_exec.c (r1.50 -> r1.51)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plpsm/plpgpsm/src/pl_exec.c.diff?r1=1.50&r2=1.51)
plpgpsm.h (r1.40 -> r1.41)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plpsm/plpgpsm/src/plpgpsm.h.diff?r1=1.40&r2=1.41)