libink: a message bus is not a peer

libink was written against the only bus it had, its own, where the
peer on the other end is the client.  A broker is not: it routes for
senders it names itself, expects a DESTINATION on anything addressed
through it, and answers on its own schedule rather than next.

Runlevels go on the wire as S and N rather than the digits Finit
keeps internally, since that is what a caller outside Finit means by
one.

The library stays a convenience library, linked into finit and
initctl and installed nowhere: the ABI promise waits until libink is
its own project.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

configure.ac

@@ -13,7 +13,7 @@ AC_CONFIG_FILES([Makefile
 	contrib/void/Makefile   contrib/void/finit.d/Makefile   contrib/void/finit.d/available/Makefile
 	doc/Makefile doc/config/Makefile
 	dbus-1/Makefile
-	libink/Makefile libink/libink.pc
+	libink/Makefile
 	libsystemd/Makefile libsystemd/libsystemd.pc
 	man/Makefile
 	plugins/Makefile