Fix argument parsing in test(1) and chmod(1)

We just take the raw argument list as is. Using arg.h, arguments
beginning with - would have been "eaten up".
Writing a special "bailout" for arg.h was not a good option,
not because it's not impossible (done in 6 LOC), but because it
is a shoehorning around a corner case present for a few programs
which are broken by design by POSIX.

chmod.c

@@ -41,8 +41,8 @@ main(int argc, char *argv[])
 	struct recursor r = { .fn = chmodr, .hist = NULL, .depth = 0, .follow = 'P', .flags = 0};
 	size_t i;
 
-	argv0 = *(argv++);
-	argc--;
+	argv0 = argv[0], argc--, argv++;
+
 	for (; *argv && (*argv)[0] == '-'; argc--, argv++) {
 		if (!(*argv)[1])
 			usage();

chown.c

@@ -52,7 +52,6 @@ main(int argc, char *argv[])
 	struct recursor r = { .fn = chownpwgr, .hist = NULL, .depth = 0, .follow = 'P', .flags = 0};
 	char *owner, *group;
 
-
 	ARGBEGIN {
 	case 'h':
 		hflag = 1;

test.c

@@ -148,10 +148,7 @@ main(int argc, char *argv[])
 	int (*narg[])(char *[]) = { noarg, onearg, twoarg, threearg, fourarg };
 	size_t len;
 
-	ARGBEGIN {
-	default:
-		break;
-	} ARGEND;
+	argv0 = argv[0], argc--, argv++;
 
 	len = strlen(argv0);
 	if (len && argv0[--len] == '[' && (!len || argv0[--len] == '/') && strcmp(argv[--argc], "]"))