package/xserver_xorg-server: not all versions need all dependencies

Support for the Present protocol has been added to, and is mandatory
since version 1.15.

As we're on the verge of adding 1.14.7, we need to make Present a
version-specific dependency.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>