Move campaign mission images to share/ instead of hardcoding them into frontend
Hardcoding campaign mission images prevented add-ons from adding their own preview images.
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := SDL_ttf
LOCAL_CFLAGS := -I$(LOCAL_PATH)/../SDL/include
LOCAL_SRC_FILES := SDL_ttf.c
LOCAL_SHARED_LIBRARIES := SDL
LOCAL_LDLIBS := -lz
include $(BUILD_SHARED_LIBRARY)