Re-allow SRFs and window functions within sub-selects within aggregates.

check_agg_arguments_walker threw an error upon seeing a SRF or window
function, but that is too aggressive: if the function is within a
sub-select then it's perfectly fine.  I broke the SRF case in commit
0436f6b by copying the logic for window functions ... but that was
broken too, and had been since commit eaccfde.

Repair both cases in HEAD, and the window function case back to 9.3.
9.2 gets this right.

Author: tglsfdc

src/backend/parser/parse_agg.c

@@ -700,7 +700,7 @@ check_agg_arguments_walker(Node *node,
 		/* Continue and descend into subtree */
 	}
 	/* We can throw error on sight for a window function */
-	if (IsA(node, WindowFunc))
+	if (IsA(node, WindowFunc) && context->sublevels_up == 0)
 		ereport(ERROR,
 				(errcode(ERRCODE_GROUPING_ERROR),
 				 errmsg("aggregate function calls cannot contain window function calls"),