* sysdeps/mach/configure.ac: Add sysheaders check. * sysdeps/mach/configure: Regenerate. * sysdeps/mach/hurd/configure.ac: Add sysheaders check. * sysdeps/mach/hurd/configure: Regenerate.
Autoconf has been deprecating configure.in for quite a long time. Rename all our configure.in and preconfigure.in files to .ac. Signed-off-by: Mike Frysinger <vapier@gentoo.org>