Bug#789373: missing license in debian/copyright

[Thorsten Alteholz]

Package: wesnoth
Version: 1:1.13.0-1
Severity: serious
User: alteholz at debian.org
Usertags: ftp
X-Debbugs-CC: ftpmaster at ftp-master.debian.org
thanks

Dear Maintainer,

please add the missing Apache-2 license of:
  DroidSans*.ttf
to your debian/copyright.

Thanks!
   Thorsten