Update autotools dependency

[HalosGhost]

It looks like there's currently a hard dependency on aclocal-1.14. On archlinux, for example, the only version of automake available is 1.16, which leads to the following build error:

CDPATH="${ZSH_VERSION+.}:" && cd . && /bin/sh /home/halosghost/prj/pkg/uacme-git/src/uacme/build-aux/missing aclocal-1.14
/home/halosghost/prj/pkg/uacme-git/src/uacme/build-aux/missing: line 81: aclocal-1.14: command not found
WARNING: 'aclocal-1.14' is missing on your system.
         You should only need it if you modified 'acinclude.m4' or
         'configure.ac' or m4 files included by 'configure.ac'.
         The 'aclocal' program is part of the GNU Automake package:
         <http://www.gnu.org/software/automake>
         It also requires GNU Autoconf, GNU m4 and Perl in order to run:
         <http://www.gnu.org/software/autoconf>
         <http://www.gnu.org/software/m4/>
         <http://www.perl.org/>
make: *** [Makefile:385: aclocal.m4] Error 127

I am not hugely familiar with autotools; is this something that is easy to change so that newer versions of automake will continue to build uacme?

[ndilieto]

Please read #2