SDL: Move debugging code to output SDL video driver name to initBackend.

The initBackend() function is called later after the command line is
parsed and thus debug() prints can be used, which are much less noisy.

backends/platform/sdl/sdl.cpp

@@ -158,6 +158,14 @@ void OSystem_SDL::initBackend() {
 	// Check if backend has not been initialized
 	assert(!_inited);
 
+	const int maxNameLen = 20;
+	char sdlDriverName[maxNameLen];
+	sdlDriverName[0] = '\0';
+	SDL_VideoDriverName(sdlDriverName, maxNameLen);
+	// Using printf rather than debug() here as debug()/logging
+	// is not active by this point.
+	debug(1, "Using SDL Video Driver \"%s\"", sdlDriverName);
+
 	// Create the default event source, in case a custom backend
 	// manager didn't provide one yet.
 	if (_eventSource == 0)
@@ -274,14 +282,6 @@ void OSystem_SDL::initSDL() {
 		if (SDL_Init(sdlFlags) == -1)
 			error("Could not initialize SDL: %s", SDL_GetError());
 
-		const int maxNameLen = 20;
-		char sdlDriverName[maxNameLen];
-		sdlDriverName[0] = '\0';
-		SDL_VideoDriverName(sdlDriverName, maxNameLen);
-		// Using printf rather than debug() here as debug()/logging
-		// is not active by this point.
-		printf("Using SDL Video Driver \"%s\" ...\n", sdlDriverName);
-
 		_initedSDL = true;
 	}
 }