pgsql: Add a hack requested by the JDBC driver writers: when a

Log Message:
-----------
Add a hack requested by the JDBC driver writers: when a function's
argument list contains parameter symbols ($n) declared as type VOID,
discard these arguments. This allows the driver to avoid renumbering
mixed IN and OUT argument placeholders (the JDBC syntax involves writing
? for both IN and OUT parameters, but on the server side we don't think
that OUT parameters are arguments). This doesn't break any currently-
useful cases since VOID is not used as an input argument type.

Modified Files:
--------------
pgsql/doc/src/sgml:
protocol.sgml (r1.58 -> r1.59)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/protocol.sgml.diff?r1=1.58&r2=1.59)
pgsql/src/backend/parser:
parse_func.c (r1.180 -> r1.181)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_func.c.diff?r1=1.180&r2=1.181)