[Gtkradiant] [Bug 700] New: update changelog.txt urls

[gtkradiant@zerowing.idsoftware.com]

http://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=700

           Summary: update changelog.txt urls
           Product: GtkRadiant
           Version: 1.2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: setup
        AssignedTo: ttimo@idsoftware.com
        ReportedBy: ttimo@idsoftware.com


old bug report url is dead