* evas: Fix two render bugs :

	* evas: Fix two render bugs :
		- Forgot to reset clip before drawing cleanup rect.
		- Always draw a rect to reset the background, just
		choose a correct color.

	Note: This will slow down software_x11 engine, as this engine
	always do memset, so it does it twice. Before only the alpha
	case was impacted, now both case are. Need time to fix it. If
	someone has, don't hesitate :-) You can use elementary windows
	state test, to see if thing is going correctly or not.

	For the record, SDL engine has a score around 500 under X11 on
	my computer, where the X11 engine does only have a score around
	450.

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/trunk/evas@41770 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33