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/testaudiocapture.c

@@ -9,10 +9,11 @@
   including commercial applications, and to alter it and redistribute it
   freely.
 */
-#include "SDL.h"
 
 #include <stdlib.h>
 
+#include "SDL.h"
+
 #ifdef __EMSCRIPTEN__
 #include <emscripten/emscripten.h>
 #endif
@@ -163,3 +164,4 @@ main(int argc, char **argv)
     return 0;
 }
 
+/* vi: set ts=4 sw=4 expandtab: */