Updated version to 2.0.8 since SDL_image depends on it

configure

@@ -2710,9 +2710,9 @@ orig_CFLAGS="$CFLAGS"
 #
 SDL_MAJOR_VERSION=2
 SDL_MINOR_VERSION=0
-SDL_MICRO_VERSION=7
+SDL_MICRO_VERSION=8
 SDL_INTERFACE_AGE=0
-SDL_BINARY_AGE=7
+SDL_BINARY_AGE=8
 SDL_VERSION=$SDL_MAJOR_VERSION.$SDL_MINOR_VERSION.$SDL_MICRO_VERSION