Use inotify to detect devices for better reliability on Linux

Fix the issue that some devices were not detected when hot plugged.

drivers/sdl/SDL_build_config_private.h

@@ -84,6 +84,11 @@
 #define HAVE_LINUX_INPUT_H 1
 #define HAVE_POLL 1
 
+#ifdef __linux__
+#define HAVE_INOTIFY 1
+#define HAVE_INOTIFY_INIT1 1
+#endif
+
 // TODO: handle dynamic loading with SOWRAP_ENABLED
 
 // (even though DBus can also be loaded with SOWRAP_ENABLED, we load it