Outdated libtool creates trouble on macOS

[FX Coudert]

> Yes. But probably not this week for me, my holidays are just starting :-)

No problem, I’ll continue to post small batches of changes here when I get some time.

Third batch of changes, dealing with the following:

warning: The macro `AC_CHECK_LIBM' is obsolete.
warning: The macro `AC_PROG_CC_C99' is obsolete.
warning: The macro `AC_PROG_LIBTOOL' is obsolete.
warning: The macro `AC_PROG_NM' is obsolete.
warning: The macro `AC_TYPE_SIGNAL' is obsolete.

These obsolescences are part of the wider move to consider that C89 (or ANSI C) is always available. They have been in autoconf since 2012.

FX

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