package/cegui: disable minizip support

Disable support for minizip since cegui is not compatible
with the existing buildroot's version due to lack of
necessary header. It will be restored when upstream will
switch to the new version.

Fixes:
 - http://autobuild.buildroot.net/results/65fa719e8b2466409a12eb103a8938e1488efc0c
 - http://autobuild.buildroot.net/results/ef37a0cc16daacb7206d736c86b511c7d90eefe0



and many more.

Signed-off-by: Bartosz Bilas <b.bilas@grinn-global.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>