Document all the portability changes to check_max
Document all the portability changes to check_max

chromatic/y2038,evalEmpire/y2038,bulk88/y2038,chromatic/y2038,bulk88/y2038,bulk88/y2038,foxtacles/y2038,schwern/y2038,foxtacles/y2038,chromatic/y2038,schwern/y2038,evalEmpire/y2038