doc: remove fdl-1.2.texi It is no longer used or maintained, and its use of @acronym is problematic. See the thread containing <http://lists.gnu.org/archive/html/bug-gnulib/2012-08/msg00134.html>. * config/srclist.txt: Remove doc/old-licenses/fdl-1.2.texi. * doc/old-licenses/fdl-1.2.texi: Remove.