apache2filter was supported in PHP <= 5.6. This patch removes some old
apache2filter occurrences. Also FreeBSD warning therefore is not needed
anymore when building PHP with apache2filter and in later versions don't
need to set the --with-tsrm-pth option.
configure.ac was introduced in 2001 with automake-1.15 and autoconf-2.50
to replace the file named configure.in.
Autotools is preparing to remove configure.in in Automake 2.0.
All new software should be using configure.ac.
This also fixes Bug #69770 where extensions are creating configure.in
Signed-off-by: Brian Evans <grknight@gentoo.org>