Bug#789374: missing license in debian/copyright

[Thorsten Alteholz]

Package: freeciv
Version: 2.5.0-2
Severity: serious
User: alteholz at debian.org
Usertags: ftp
X-Debbugs-CC: ftpmaster at ftp-master.debian.org
thanks

Dear Maintainer,

data/flags/sikkim.svg seems to be licensed under CC 2.0 which is 
incompatible with DFSG. Please remove this file from the source tarball.

data/flags/saxony.svg is licensed under CC 3.0. Please mention this in 
your debian/copyright.

Thanks!
   Thorsten