libowl/settings-daemon/libnotify: add x11 to REQUIRED_DISTRO_FEATURES
The libowl, settings-daemon and libnotify requires gdk/gdkx.h which is
provided by gtk when x11 in DISTRO_FEATURES, so add x11 to
REQUIRED_DISTRO_FEATURES.
The leafpad, settings-daemon and oh-puzzles requires
libowl or settings-daemon, so add xx to REQUIRED_DISTRO_FEATURES for
them too.
The leafpad can't be built without libowl, so depends in directly rather
than use DEPENDS_append_poky.
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
