Update physfs to include windows10 build 1809 issue
Update physfs to include windows10 build 1809 issue

FranciscoDA/OpenApoc,FranciscoDA/OpenApoc,Istrebitel/OpenApoc,Istrebitel/OpenApoc,FranciscoDA/OpenApoc,pmprog/OpenApoc,steveschnepp/OpenApoc,pmprog/OpenApoc,steveschnepp/OpenApoc