add mac target
add mac target

NiLuJe/koreader-base,koreader/koreader-base,Frenzie/koreader-base,koreader/koreader-base,Frenzie/koreader-base,koreader/koreader-base,koreader/koreader-base,NiLuJe/koreader-base,Frenzie/koreader-base,NiLuJe/koreader-base,NiLuJe/koreader-base,Frenzie/koreader-base