package/efl/libefl: add X11 support

Add an option to enable X11 support in libecore without graphic
acceleration. libecore can use xlib or xcb support but the latter
in not recommended by efl developpers [1]. Thereby the xcb support
has been dropped with the bump to efl 1.15.

Also, set x-includes and x-libraries configure option for cross-compiling.
Previous efl versions had cross-compilation issue (poisoned paths)
if these options are not passed to configure script.

In order to remove the dependency on libXp wich is no longer bundled in
recent X11 release [2], backport an upstream patch [3] to remove xprint
usage.

[1] https://git.enlightenment.org/core/efl.git/tree/configure.ac#n5002
[2] http://www.x.org/wiki/Releases/ModuleVersions
[3] https://git.enlightenment.org/core/efl.git/commit/?h=efl-1.15&id=434572355c7e929b84210b2f795634d38f13c913



Signed-off-by: Romain Naour <romain.naour@openwide.fr>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>