Remove some rarely-used headers from library pch
Remove some rarely-used headers from library pch

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