fixed build issues on travis ci
fixed build issues on travis ci

mpalet/fann,joelself/FannCSharp,joelself/FANNCSharpCore,mpalet/fann,joelself/FannCSharp,joelself/FANNCSharpCore,libfann/fann,joelself/FannCSharp,libfann/fann,libfann/fann,mpalet/fann,joelself/FANNCSharpCore,mpalet/fann,joelself/FANNCSharpCore,libfann/fann,joelself/FannCSharp,joelself/FANNCSharpCore,joelself/FannCSharp