Contrib: SDL minor update.

extras/contrib/src/packages.mak

@@ -162,7 +162,7 @@ JPEG_URL=$(VIDEOLAN)/contrib/jpeg-$(JPEG_VERSION).tar.gz
 TIFF_VERSION=3.8.2
 #TIFF_URL=ftp://ftp.remotesensing.org/libtiff/tiff-$(TIFF_VERSION).tar.gz
 TIFF_URL=http://dl.maptools.org/dl/libtiff/tiff-$(TIFF_VERSION).tar.gz
-SDL_VERSION=1.2.12
+SDL_VERSION=1.2.13
 SDL_URL=http://www.libsdl.org/release/SDL-$(SDL_VERSION).tar.gz
 SDL_IMAGE_VERSION=1.2.6
 SDL_IMAGE_URL=http://www.libsdl.org/projects/SDL_image/release/SDL_image-$(SDL_IMAGE_VERSION).tar.gz