configure: fix SDL2 version check for pkg_config fallback

pkg_config fallback for SDL2 use 2.1.0 as max (excluded) version
where the pkg_config specify 3.0.0
Correcting fallback version to be in line with the pkg_config version

Signed-off-by: dvhh <dvhh@yahoo.com>
Signed-off-by: Marton Balint <cus@passwd.hu>

configure

@@ -6756,7 +6756,7 @@ if enabled sdl2; then
         sdl2_cflags=$("${SDL2_CONFIG}" --cflags)
         sdl2_extralibs=$("${SDL2_CONFIG}" --libs)
         test_cpp_condition SDL.h "(SDL_MAJOR_VERSION<<16 | SDL_MINOR_VERSION<<8 | SDL_PATCHLEVEL) >= 0x020001" $sdl2_cflags &&
-        test_cpp_condition SDL.h "(SDL_MAJOR_VERSION<<16 | SDL_MINOR_VERSION<<8 | SDL_PATCHLEVEL) < 0x020100" $sdl2_cflags &&
+        test_cpp_condition SDL.h "(SDL_MAJOR_VERSION<<16 | SDL_MINOR_VERSION<<8 | SDL_PATCHLEVEL) < 0x030000" $sdl2_cflags &&
         check_func_headers SDL_events.h SDL_PollEvent $sdl2_extralibs $sdl2_cflags &&
             enable sdl2
     fi