Remove SDL_config.h from the public headers

The SDL headers are no longer dependent on the build configuration.

Fixes https://github.com/libsdl-org/SDL/issues/6643 and https://github.com/libsdl-org/SDL/issues/6641

test/testgesture.c

@@ -16,9 +16,10 @@
  *  l to load all touches from "./gestureSave"
  */
 
-#include "SDL.h"
 #include <stdlib.h> /* for exit() */
 
+#include "SDL.h"
+
 #ifdef __EMSCRIPTEN__
 #include <emscripten/emscripten.h>
 #endif
@@ -298,3 +299,4 @@ int main(int argc, char* argv[])
     return 0;
 }
 
+/* vi: set ts=4 sw=4 expandtab: */