libink/finit: properties, and org.finit on the system bus

Runlevel and version are state, not actions, so they belong behind
org.freedesktop.DBus.Properties rather than another method each.

Finit also claims org.finit on the system bus when it finds one, so
ordinary D-Bus clients can reach it without knowing about
/run/finit/bus.  Opportunistic on purpose: no dbus-daemon is a normal
state for the systems Finit runs on, not an error to report.

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

libink/dispatch.c

@@ -298,6 +298,7 @@ void link_w_bool    (link_writer_t *w, int v)            { __w_bool(w, v); }
 void link_w_u32     (link_writer_t *w, uint32_t v)       { __w_u32(w, v);  }
 void link_w_string  (link_writer_t *w, const char *s)    { __w_string(w, s); }
 void link_w_path    (link_writer_t *w, const char *s)    { __w_path(w, s);   }
+void link_w_variant_string(link_writer_t *w, const char *s) { __w_variant_string(w, s); }
 void link_w_array_begin (link_writer_t *w, char ec)      { __w_array_begin(w, ec); }
 void link_w_array_end   (link_writer_t *w)               { __w_array_end(w);       }
 void link_w_struct_begin(link_writer_t *w)               { __w_struct_begin(w); }
@@ -311,6 +312,9 @@ int  link_r_bool  (link_reader_t *r, int      *o)     { return __r_bool  (r, o);
 int  link_r_u32   (link_reader_t *r, uint32_t *o)     { return __r_u32   (r, o); }
 int  link_r_string(link_reader_t *r, const char **o)  { return __r_string(r, o); }
 int  link_r_path  (link_reader_t *r, const char **o)  { return __r_path  (r, o); }
+int  link_r_variant_string(link_reader_t *r, const char **o) { return __r_variant_string(r, o); }
+int  link_r_align (link_reader_t *r, size_t n)        { return __r_align (r, n); }
+int  link_r_array_begin(link_reader_t *r, size_t *e)  { return __r_array_begin(r, e); }
 int  link_r_done  (const link_reader_t *r)            { return __r_done  (r);    }
 size_t link_r_pos (const link_reader_t *r)            { return r->off;           }