afl-fuzz: port improvements from 2.43b
afl-fuzz: port improvements from 2.43b

ivanfratric/winafl,googleprojectzero/winafl,0vercl0k/winafl,ivanfratric/winafl,googleprojectzero/winafl,0vercl0k/winafl,ivanfratric/winafl,googleprojectzero/winafl,0vercl0k/winafl,ivanfratric/winafl,0vercl0k/winafl,googleprojectzero/winafl