require efl >= 1.16 for wayland support

the fact is that nobody developing this has tested with 1.15.x recently,
and almost none of the changes have been backported to that branch. better
to require a newer version than to present a failing user experience

configure.ac

@@ -742,7 +742,7 @@ AC_MSG_CHECKING([whether wayland EGL support is enabled])
 AC_MSG_RESULT([${e_cv_want_wayland_egl}])
 
 if test "x${e_cv_want_wayland_only}" != "xno" ;then
-  PKG_CHECK_MODULES([WAYLAND], [ecore-wayland wayland-server >= 1.8.0 wayland-client >= 1.8.0 xkbcommon uuid],
+  PKG_CHECK_MODULES([WAYLAND], [ecore-wayland >= 1.16 wayland-server >= 1.8.0 wayland-client >= 1.8.0 xkbcommon uuid],
     [
       have_wayland=yes
       AC_DEFINE_UNQUOTED([HAVE_WAYLAND],[1],[enable wayland support])