fix https://ci.appveyor.com/project/grzegorzmazur/yacas/build/1.0.197
fix https://ci.appveyor.com/project/grzegorzmazur/yacas/build/1.0.197
grzegorzmazur/yacas,grzegorzmazur/yacas,qwert2003/yacas,qwert2003/yacas,martanoga/yacas,martanoga/yacas,qwert2003/yacas,qwert2003/yacas,martanoga/yacas,martanoga/yacas,qwert2003/yacas,qwert2003/yacas,martanoga/yacas,grzegorzmazur/yacas,grzegorzmazur/yacas,grzegorzmazur/yacas,qwert2003/yacas,grzegorzmazur/yacas,grzegorzmazur/yacas,martanoga/yacas,martanoga/yacas