add mz_prepare_for_backgrounding to mz_android
add mz_prepare_for_backgrounding to mz_android

weianwang/card.io-dmz,AlanYen/card.io-dmz,weianwang/card.io-dmz,weianwang/card.io-dmz,devinus/card.io-dmz,AlanYen/card.io-dmz,AlanYen/card.io-dmz,weianwang/card.io-dmz,devinus/card.io-dmz,alex-schwartzman/card.io-dmz,devinus/card.io-dmz,AlanYen/card.io-dmz,alex-schwartzman/card.io-dmz,AlanYen/card.io-dmz,devinus/card.io-dmz,alex-schwartzman/card.io-dmz,devinus/card.io-dmz,alex-schwartzman/card.io-dmz,weianwang/card.io-dmz,alex-schwartzman/card.io-dmz