Finally deprecate all legacy do_stage functions. This changes the existing warning

into a fatal error if any legacy do_stage functions are found.

Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

meta/classes/cross.bbclass

@@ -50,10 +50,6 @@ do_install () {
 	oe_runmake 'DESTDIR=${D}' install
 }
 
-do_stage () {
-	autotools_stage_all
-}
-
 #
 # Override the default sysroot staging copy since this won't look like a target system
 #