pgsql: Back out patch, wrong previous commit message.

Log Message:
-----------
Back out patch, wrong previous commit message.

Modified Files:
--------------
pgsql/doc/src/sgml:
plpgsql.sgml (r1.91 -> r1.92)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/plpgsql.sgml.diff?r1=1.91&r2=1.92)
pgsql/src/pl/plpgsql/src:
pl_comp.c (r1.103 -> r1.104)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/pl_comp.c.diff?r1=1.103&r2=1.104)
pl_exec.c (r1.166 -> r1.167)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/pl_exec.c.diff?r1=1.166&r2=1.167)
pl_funcs.c (r1.49 -> r1.50)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/pl_funcs.c.diff?r1=1.49&r2=1.50)
plpgsql.h (r1.71 -> r1.72)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/plpgsql.h.diff?r1=1.71&r2=1.72)
scan.l (r1.46 -> r1.47)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/scan.l.diff?r1=1.46&r2=1.47)
pgsql/src/test/regress/expected:
plpgsql.out (r1.46 -> r1.47)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/plpgsql.out.diff?r1=1.46&r2=1.47)
pgsql/src/test/regress/sql:
plpgsql.sql (r1.39 -> r1.40)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/plpgsql.sql.diff?r1=1.39&r2=1.40)