package/x11r7/xapp_xeyes: add xlib_libXi mandatory dependency

Build fails since commit c47ebe7a
because xlib_libXi is a mandatory dependency since version 1.2.0 and
https://gitlab.freedesktop.org/xorg/app/xeyes/-/commit/420c2d8517246c9e422739cadb7acb29e35a3bed:

configure: error: Package requirements (xi >= 1.7 x11 xt xext xmu xproto >= 7.0.17) were not met:

Package 'xi', required by 'virtual:world', not found

Fixes:
 - http://autobuild.buildroot.org/results/896f45fb9eadcd235aeab096db479ee0aa5d0860



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[yann.morin.1998@free.fr: split multi-line dependency]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>