Remove long since deprecated finit.conf: console <DEV> support

All this code did was trigger prctl() to set process name to "console",
which you could use as a simple means of figuring out if a process was
started from the system console.

There are other ways to do this, which Finit should not be involved in.

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

src/finit.h

@@ -98,7 +98,6 @@ extern char  *sdown;
 extern char  *network;
 extern char  *hostname;
 extern char  *runparts;
-extern char  *console;
 extern uev_ctx_t *ctx;
 
 #endif /* FINIT_H_ */