- Update to version 1.13.1:
* Bugs fixed:
- Use of the obsolete macros AM_CONFIG_HEADER or AM_PROG_CC_STDC now
causes a clear and helpful error message, instead of obscure ones
(issue introduced in Automake 1.13).
- Remove config-guess-sub-update.diff; config.guess and config.sub are
not included anymore in /lib
- Clean the specfile; remove useless conditionnal macros
- Automake now provide manfiles by default and help2man is not required
anymore

- Run pre_checkin.sh to sync automake-testsuite pec and .changes.

- Update to 1.12.3:
- reworks and reshuffles the Automake testsuite a bit; fixing some
weaknesses and spurious failures in the process, but also, likely,
introducing new ones;
- introduces initial support for automatic dependency tracking with
the Portland Group C/C++ compilers (thanks to Dave Goodell and
Jeff A. Daily);
- fixes several long-standing bugs and limitations in the 'ylwrap'
script (thanks to Akim Demaille); among the other things, the
long-standing PR/491 and automake bug#7648 are now fixed.

- make sure we still define $(mkdir_p) for the time being

- Update to version 1.13.1:
* Bugs fixed:
- Use of the obsolete macros AM_CONFIG_HEADER or AM_PROG_CC_STDC now
causes a clear and helpful error message, instead of obscure ones