boud/metaio: Minor fork of 'metaio' by 'lscsoft' starting from commit e61744e6 for convenience in making installable tarballs: https://git.ligo.org/lscsoft/metaio - Codeberg.org

Commit e61744e6 of 'metaio' [1] does not include a top-level
'configure' file. On a current Debian/bookworm GNU/Linux OS,
'autoreconf' gives several warnings and errors in trying to
produce 'configure'.
This commit:
* provides 'configure', using autotool versions as listed below
[2];
* adds files copied into place or created by 'autoreconf -f -i';
and
* changes AC_HELP_STRING to AS_HELP_STRING in the three
'gnuscripts/m*.m4" scripts.
The aim is that this version of the package should, in principle,
be highly portable for compiling and installing with
 ./configure && make && make install
without needing the autotools as packages in the host OS.
[1] https://git.ligo.org/lscsoft/metaio
[2] autotools versions:
ii autoconf 2.71-3 all automatic configure script builder
ii automake 1:1.16.5-1.3 all Tool for generating GNU Standards-compliant Makefiles
ii autotools-dev 20220109.1 all Update infrastructure for config.{guess,sub} files
ii libtool 2.4.7-7~deb12u1 all Generic library support script
ii libtool-bin 2.4.7-7~deb12u1 amd64 Generic library support script (libtool binary)