package/x11r7/xapp_xeyes: Add dependency to xlib_libXrender

xeyes depends on Xrender since version 1.1.0
http://lists.freedesktop.org/archives/xorg/2009-December/048305.html

Fixes
http://autobuild.buildroot.net/results/bae/baeded072fbec4a398738e00dbf851d756af660f/



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