xserver_xorg-server: Remove unused null root cursor option

Upstream removed this configure option back in 2010 (for server 1.8):

http://cgit.freedesktop.org/xorg/xserver/commit/?id=60b6477f6dc005a1b052be8c5

So this hasn't done anything since 759d548e3e5 (xserver_xorg-server: bump
version).

Don't add any Config.in.legacy for this as it as been broken for so long any
way.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/x11r7/xserver_xorg-server/Config.in

@@ -90,11 +90,6 @@ config BR2_PACKAGE_XSERVER_XORG_SERVER_KDRIVE
 
 endchoice
 
-config BR2_PACKAGE_XSERVER_XORG_SERVER_NULL_CURSOR
-	bool "Null root cursor"
-	help
-	  Don't display root cursor.
-
 config BR2_PACKAGE_XSERVER_XORG_SERVER_AIGLX
 	bool "Enable AIGLX Extension"
 	help

package/x11r7/xserver_xorg-server/xserver_xorg-server.mk

@@ -112,12 +112,6 @@ else
 XSERVER_XORG_SERVER_CONF_OPTS += --disable-dri --disable-glx
 endif
 
-ifeq ($(BR2_PACKAGE_XSERVER_XORG_SERVER_NULL_CURSOR),y)
-XSERVER_XORG_SERVER_CONF_OPTS += --enable-null-root-cursor
-else
-XSERVER_XORG_SERVER_CONF_OPTS += --disable-null-root-cursor
-endif
-
 ifeq ($(BR2_PACKAGE_XSERVER_XORG_SERVER_AIGLX),y)
 XSERVER_XORG_SERVER_CONF_OPTS += --enable-aiglx
 else