Added SDL2 android files.

modules/sdl2/makefile_android.monkey2

@@ -0,0 +1,8 @@
+
+Namespace sdl2
+
+#Import "<libdl.a>"
+
+#Import "SDL/jniLibs/armeabi-v7a/libSDL2.so"
+
+#Import "SDL/src/main/android/SDL_android_main.c"