Add -Wlarge-constant to RGBLINK as it is for RGBASM

contrib/bash_compl/_rgblink.bash

@@ -142,6 +142,7 @@ _rgblink_completions() {
 			mapfile -t COMPREPLY < <(compgen -W "
 				assert
 				div
+				large-constant
 				obsolete
 				shift
 				shift-amount

contrib/zsh_compl/_rgblink

@@ -9,6 +9,7 @@ _rgblink_warnings() {
 
 		'assert:Warn when WARN-type asserts fail'
 		'div:Warn when dividing the smallest int by -1'
+		'large-constant:Warn on constants too large for a signed 32-bit int'
 		'obsolete:Warn when using deprecated features'
 		'shift:Warn when shifting negative values'
 		'shift-amount:Warn when a shift'\''s operand is negative or \> 32'