Temporarily default Wayland and Mir to disabled, for 2.0.2 release.

We'll flip the default back to enabled right after 2.0.2 is finalized, and
try to declare them stable and ready by 2.0.3.

Those that have an interest in supporting them in 2.0.2 can manually enable
 them in the configure script with --enable-video-wayland and/or
 --enable-video-mir.

configure.in

@@ -1164,7 +1164,7 @@ CheckWayland()
 {
     AC_ARG_ENABLE(video-wayland,
 AC_HELP_STRING([--enable-video-wayland], [use Wayland video driver [[default=yes]]]),
-                  ,enable_video_wayland=yes)
+                  ,enable_video_wayland=no) #yes)
 
     AC_ARG_ENABLE(video-wayland-qt-touch,
 AC_HELP_STRING([--enable-video-wayland-qt-touch], [QtWayland server support for Wayland video driver [[default=yes]]]),
@@ -1246,7 +1246,7 @@ CheckMir()
 {
     AC_ARG_ENABLE(video-mir,
 AC_HELP_STRING([--enable-video-mir], [use Mir video driver [[default=yes]]]),
-                  ,enable_video_mir=yes)
+                  ,enable_video_mir=no) #yes)
 
     if test x$enable_video = xyes -a x$enable_video_mir = xyes; then
         AC_PATH_PROG(PKG_CONFIG, pkg-config, no)