package/x11r7/xapp_xeyes: xrender is optional, not mandatory

xrender is optional, not mandatory since its addition in version 1.0.99:
https://gitlab.freedesktop.org/xorg/app/xeyes/-/commit/5e825a140f4022b88dd7a1a20a9a01b653f1a95c



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>