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auth/box: bind in the binary by default

This prevents stuttering on the command line by
not having to give a -r flag for the binary itself.

--- a/sys/src/cmd/auth/box.c

+++ b/sys/src/cmd/auth/box.c

@@ -54,9 +54,6 @@

 		case '#':

 		case '/':

 			break;

-		case '.':

-			if(names[i][1] == '/')

-				break;

 		default:

 			names[i] = cleanname(smprint("%s/%s", buf, names[i]));

 		}	

@@ -111,19 +108,6 @@

 	binderr(newroot, "/", MREPL);

 }

-static void

-run(char **a)

-{

-	exec(a[0], a);

-

-	if(a[0][0] != '/' && a[0][0] != '#' &&

-	  (a[0][0] != '.' || (a[0][1] != '/' &&

-		             (a[0][1] != '.' ||  a[0][2] != '/'))))

-		exec(smprint("/bin/%s", a[0]), a);

-

-	sysfatal("exec: %s: %r", a[0]);

-}

-

 void

 usage(void)

 {

@@ -134,6 +118,8 @@

 void

 main(int argc, char **argv)

 {

+	char *b;

+	Dir *d;

 	char devs[1024];

 	int dfd;

 	char *parts[256];

@@ -164,6 +150,19 @@

 	if(argc == 0)

 		usage();

+	b = argv[0];

+	d = dirstat(b);

+	if(d == nil){

+		b = smprint("/bin/%s", b);

+		d = dirstat(b);

+		if(d == nil)

+			sysfatal("could not stat %s %r", argv[0]);

+	}

+	free(d);

+	parts[nparts] = b;

+	mflags[nparts++] = MREPL;

+	argv[0] = b;

+

 	rfork(RFNAMEG|RFENVG);

 	dfd = open("/dev/drivers", OWRITE|OCEXEC);

 	if(dfd < 0)

@@ -188,5 +187,5 @@

 			sysfatal("could not write chdev: %r");

 	}

 	close(dfd);

-	run(argv);

+	exec(argv[0], argv);

 }