travis-ci: Disable lto
travis-ci: Disable lto

apparently -flto breaks clang... And that's probably more useful
coverage than just gcc even with lto

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