weston-wfits: workaround to enable deprecated wl api's for now.

compositor.h does "#define WL_HIDE_DEPRECATED" before including
wayland-server.h and therefore doesn't allow for the deprecated
wayland API's to be used.  To workaround this, we include
wayland-server.h before including compositor.h for now.

Soon, however, we need to update to the new wayland stable API
to be compliant.  Will likely drop support for < 1.2 at the same
time to avoid compile time #ifdef version checks in the weston
extension.

Signed-off-by: U. Artie Eoff <ullysses.a.eoff@intel.com>