package/sdl2: Remove trailing backslash

Left over from 9f8a6fdf9

Signed-off-by: Guillermo A. Amaral <g@maral.me>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/sdl2/sdl2.mk

@@ -18,7 +18,7 @@ SDL2_CONF_OPTS += \
 	--disable-esd \
 	--disable-dbus \
 	--disable-pulseaudio \
-	--disable-video-wayland \
+	--disable-video-wayland
 
 # We must enable static build to get compilation successful.
 SDL2_CONF_OPTS += --enable-static