bring back gifalloc.c dependency
bring back gifalloc.c dependency

neophob/lwip,weareu/lwip,sanemat/lwip,GrimDerp/lwip,antoinepairet/lwip,gimox/lwip,gimox/lwip,unbornchikken/lwip,lpicanco/lwip,sanemat/lwip,domosapien/lwip,EyalAr/lwip,cocos-creator/lwip,fireball-x/lwip,weareu/lwip,fireball-x/lwip,michaelBenin/lwip,gimox/lwip,michaelBenin/lwip,sanemat/lwip,EyalAr/lwip,lpicanco/lwip,EyalAr/lwip,mottx/lwip,fireball-x/lwip,weareu/lwip,neophob/lwip,lpicanco/lwip,oliversalzburg/lwip,unbornchikken/lwip,GrimDerp/lwip,sanemat/lwip,oliversalzburg/lwip,unbornchikken/lwip,michaelBenin/lwip,neophob/lwip,mottx/lwip,GrimDerp/lwip,oliversalzburg/lwip,neophob/lwip,mottx/lwip,mottx/lwip,oliversalzburg/lwip,antoinepairet/lwip,cocos-creator/lwip,cocos-creator/lwip,domosapien/lwip,MAMISHO/lwip,gimox/lwip,lpicanco/lwip,unbornchikken/lwip,domosapien/lwip,weareu/lwip,michaelBenin/lwip,fireball-x/lwip,MAMISHO/lwip,antoinepairet/lwip,antoinepairet/lwip,domosapien/lwip,cocos-creator/lwip,GrimDerp/lwip,MAMISHO/lwip,MAMISHO/lwip,EyalAr/lwip