xapp_xconsole: Needs MMU

Fixes
http://autobuild.buildroot.net/results/be8/be89847832a2588dbda8dd921edb09b2af130e03/

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/x11r7/xapp_xconsole/Config.in

@@ -5,5 +5,6 @@ config BR2_PACKAGE_XAPP_XCONSOLE
 	select BR2_PACKAGE_XLIB_LIBXT
 	select BR2_PACKAGE_XPROTO_XPROTO
 	select BR2_PACKAGE_XLIB_LIBXMU
+	depends on BR2_USE_MMU # fork()
 	help
 	  xconsole - monitor system console messages with X