Log Message:
-----------
Fix IsBinaryCoercible to not confuse a cast using in/out functions
with binary compatibility.
Backpatch to 8.4 where INOUT casts were introduced.
Modified Files:
--------------
pgsql/src/backend/parser:
parse_coerce.c (r2.181 -> r2.182)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_coerce.c?r1=2.181&r2=2.182)