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>

libink/Makefile.am

@@ -1,5 +1,10 @@
 # libink — brokerless D-Bus library (server + client), born inside Finit
-lib_LTLIBRARIES          = libink.la
+#
+# Internal convenience library: linked statically into finit and
+# initctl, nothing installed.  Public install (and the ABI promise
+# that comes with it) is deferred until libink is extracted into its
+# own project.
+noinst_LTLIBRARIES       = libink.la
 libink_la_SOURCES        = server.c auth.c connection.c \
                            proto.c proto.h               \
                            marshal.c marshal.h           \
@@ -7,16 +12,7 @@ libink_la_SOURCES        = server.c auth.c connection.c \
                            match.c                       \
                            path.c                        \
                            client.c io.c                 \
-                           internal.h
+                           link.h path.h internal.h
 
-libink_la_LDFLAGS        = -version-info 0:0:0
 libink_la_CPPFLAGS       = -D_GNU_SOURCE -D_DEFAULT_SOURCE -D_BSD_SOURCE
 libink_la_CFLAGS         = -W -Wall -Wextra -Wno-unused-parameter -std=gnu99
-
-# pkg-config support
-pkgconfigdir = $(libdir)/pkgconfig
-pkgconfig_DATA = libink.pc
-
-# Public headers install to $(includedir)/ink/
-inkdir = $(includedir)/ink
-ink_HEADERS = link.h path.h