sdl: ensure mesa3d gets built before if enabled for opengl support

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/sdl/sdl.mk

@@ -44,6 +44,10 @@ ifeq ($(BR2_PACKAGE_ALSA_LIB),y)
 SDL_DEPENDENCIES += alsa-lib
 endif
 
+ifeq ($(BR2_PACKAGE_MESA3D),y)
+SDL_DEPENDENCIES += mesa3d
+endif
+
 SDL_CONF_OPT += --enable-pulseaudio=no \
 		--disable-arts \
 		--disable-esd \