simplify this...)
- disable propolice on DragonFly
- use void (*)(int) as type of sa_handler as by SUS
- correctly annotate info usage, bump revision for this
USE_TOOLS and any of "autoconf", "autoconf213", "automake" or
"automake14". Also, we don't need to call the auto* tools via
${ACLOCAL}, ${AUTOCONF}, etc., since the tools framework takes care
to symlink the correct tool to the correct name, so we can just use
aclocal, autoconf, etc.