sdl: bump version

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

package/sdl/sdl.mk

@@ -3,9 +3,10 @@
 # SDL
 #
 #############################################################
-SDL_VERSION:=1.2.14
-SDL_SOURCE:=SDL-$(SDL_VERSION).tar.gz
-SDL_SITE:=http://www.libsdl.org/release
+
+SDL_VERSION = 1.2.15
+SDL_SOURCE = SDL-$(SDL_VERSION).tar.gz
+SDL_SITE = http://www.libsdl.org/release
 SDL_INSTALL_STAGING = YES
 SDL_CONF_ENV = ac_cv_path_DIRECTFBCONFIG=$(STAGING_DIR)/usr/bin/directfb-config