Android: Fix build with disable_3d

Fixes godotengine#103516.

Author: akien-mga

platform/android/java_godot_lib_jni.cpp

@@ -49,6 +49,7 @@
 #include "core/config/project_settings.h"
 #include "core/input/input.h"
 #include "main/main.h"
+#include "servers/rendering_server.h"
 
 #ifndef _3D_DISABLED
 #include "servers/xr_server.h"