Change the minimum version of automake to 1.13 and autoconf to 2.67

[ygj6]

When I run make check via automake with a version of 1.12.6 or lower, I got this error:

/bin/sh: line 9: ./test_runner_epoll: No such file or directory
FAIL: test_runner_epoll
/bin/sh: line 9: ./test_runner_select: No such file or directory
FAIL: test_runner_select
/bin/sh: line 9: ./test_runner_kqueue: No such file or directory
FAIL: test_runner_kqueue
/bin/sh: line 9: ./test_runner_evport: No such file or directory
FAIL: test_runner_evport
/bin/sh: line 9: ./test_runner_devpoll: No such file or directory
FAIL: test_runner_devpoll
/bin/sh: line 9: ./test_runner_poll: No such file or directory
FAIL: test_runner_poll
/bin/sh: line 9: ./test_runner_win32: No such file or directory
FAIL: test_runner_win32
/bin/sh: line 9: ./test_runner_timerfd: No such file or directory
FAIL: test_runner_timerfd
/bin/sh: line 9: ./test_runner_changelist: No such file or directory
FAIL: test_runner_changelist
/bin/sh: line 9: ./test_runner_timerfd_changelist: No such file or directory
FAIL: test_runner_timerfd_changelist

Open the Makefile generated by command ./autogen.sh && ./configure
I can see the errors are caused by this line:

if $(TESTS_ENVIRONMENT) $${dir}$$tst $(AM_TESTS_FD_REDIRECT); then

$${dir}$$tst will expand to ./test_runner_epoll, but test_runner_epoll is only a target in test/include.am,
not a file, so it print:

/bin/sh: line 9: ./test_runner_epoll: No such file or directory.

It seems like a bug in automake 1.12.6.
The errors will disappear if I simply upgrade automake to 1.13, and upgrade autoconf to 2.65
(2.65 is the lowest version dependent by automake-1.13).

When I build with automake-1.13 and autoconf-2.66, I got another error:

configure.ac:667: error: AC_CHECK_SIZEOF: requires literal arguments

The code in configure.ac line 667 is :

AC_CHECK_SIZEOF(void *)

It is a bug in autoconf-2.66 :
http://gnu-autoconf.7623.n7.nabble.com/AC-CHECK-SIZEOF-int-is-error-in-autoconf-2-66-td13537.html

Finally, everything works fine when using automake-1.13 and autoconf-2.67.
Refs: #858

[coveralls]

Coverage decreased (-0.03%) to 81.502% when pulling 610e6f9 on ygj6:autoconf into f05ba67 on libevent:master.

[Omega-Ariston]

very observant 👍

[azat]

Applied, thanks again for all the details!

[ygj6]

Upgrading autoconf can lead to redundant code, such as unnecessary macro checks.
Also, some macros are not recommended because they are obsolete.
I'm not sure if it's necessary to fix them since the original code can be built smoothly.

I still write this patch : ygj6@b2d119d
I would be happy if someone needs it.

[azat]

ygj6@b2d119d

Going to apply it to upstream, thanks!