error MSB8031: Building an MFC project for a non-Unicode character set is deprecated

はじめに Visual Studio Community 2013でMFCのソリューションをビルドしようとしたら、以下のエラーになりました。 error MSB8031: Building an MFC project for a non-Unicode character set is deprecated. You must change the project property to Unicode or download an additional library. See http://go.microso…