msvc 2013 fixes
msvc 2013 fixes

Accidently removed from previous change - required as there's no default
istream() constructor according to the standard (Again, presumably gcc
playing fast-and-loose here :)

agry/x-com,agry/x-com,steveschnepp/OpenApoc,AndO3131/OpenApoc,steveschnepp/OpenApoc,AndO3131/OpenApoc,Istrebitel/OpenApoc,FranciscoDA/OpenApoc,FranciscoDA/OpenApoc,agry/x-com,AndO3131/OpenApoc,ShadowDancer/OpenApoc,FranciscoDA/OpenApoc,ShadowDancer/OpenApoc,Istrebitel/OpenApoc,pmprog/OpenApoc,pmprog/OpenApoc