Fixed implicit function declaration warning in joystick source for Android.

src/joystick/android/SDL_sysjoystick.c

@@ -31,9 +31,11 @@
 #include "SDL_joystick.h"
 #include "SDL_hints.h"
 #include "SDL_assert.h"
+#include "SDL_log.h"
 #include "../SDL_sysjoystick.h"
 #include "../SDL_joystick_c.h"
 #include "../../core/android/SDL_android.h"
+
 #include "android/keycodes.h"
 
 /* As of platform android-14, android/keycodes.h is missing these defines */