Add GUC parameter check_function_bodies to control whether validation

of function bodies is done at CREATE FUNCTION time.  This is normally
true but can be set false to avoid problems with forward references,
wrong schema search path, etc.  This is just the backend patch, still
need to adjust pg_dump to make use of it.

src/backend/utils/misc/postgresql.conf.sample

@@ -205,6 +205,7 @@
 # - Statement Behavior -
 
 #search_path = '$user,public'	# schema names
+#check_function_bodies = true
 #default_transaction_isolation = 'read committed'
 #default_transaction_read_only = false
 #statement_timeout = 0		# 0 is disabled, in milliseconds