travis-ci: fixed mingw cross compile build
travis-ci: fixed mingw cross compile build

fixes #906

mtrojnar/OpenSC,fabled/OpenSC,hongquan/OpenSC-main,dengert/OpenSC,mtrojnar/OpenSC,frankmorgner/OpenSC,dengert/OpenSC,mouse07410/OpenSC,AktivCo/OpenSC,mouse07410/OpenSC,metsma/OpenSC,rickyepoderi/OpenSC,philipWendland/OpenSC,Jakuje/OpenSC,hhonkanen/OpenSC,Jakuje/OpenSC,viktorTarasov/OpenSC-SM,fabled/OpenSC,philipWendland/OpenSC,CardContact/OpenSC,viktorTarasov/OpenSC-SM,AktivCo/OpenSC,jpki/OpenSC,hhonkanen/OpenSC,fabled/OpenSC,hongquan/OpenSC-main,dengert/OpenSC,AktivCo/OpenSC,OpenSC/OpenSC,frankmorgner/OpenSC,Jakuje/OpenSC,frankmorgner/OpenSC,metsma/OpenSC,philipWendland/OpenSC,fabled/OpenSC,rickyepoderi/OpenSC,LudovicRousseau/OpenSC,hhonkanen/OpenSC,mouse07410/OpenSC,viktorTarasov/OpenSC-SM,LudovicRousseau/OpenSC,OpenSC/OpenSC,LudovicRousseau/OpenSC,CardContact/OpenSC,hongquan/OpenSC-main,Jakuje/OpenSC,OpenSC/OpenSC,jpki/OpenSC,frankmorgner/OpenSC,CardContact/OpenSC,mtrojnar/OpenSC,jpki/OpenSC,rickyepoderi/OpenSC,metsma/OpenSC