Updated gnuchess packages fix security vulnerability

Updated gnuchess package fixes security vulnerability: A vulnerability was found in GNU Chess 6.2.5, there is a stack-based buffer overflow in the cmdload function in frontend/cmd.cc via a crafted chess position in an EPD file CVE-2019-15767...

UBUNTU-CVE-2019-15767

In GNU Chess 6.2.5, there is a stack-based buffer overflow in the cmdload function in frontend/cmd.cc via a crafted chess position in an EPD file...