add c99 flag for compilation
add c99 flag for compilation

victorgan/coco,yxliang/coco,CVML/coco,pdollar/coco,chenfsjz/coco,chenfsjz/coco,CVML/coco,CVML/coco,chenfsjz/coco,yxliang/coco,gnauhnoj/coco,pdollar/coco,mprat/coco,yxliang/coco,pdollar/coco,victorgan/coco,mprat/coco,yxliang/coco,chenfsjz/coco,victorgan/coco,CVML/coco,victorgan/coco,mprat/coco,gnauhnoj/coco,gnauhnoj/coco,pdollar/coco,mprat/coco,gnauhnoj/coco