Use use ${INSTALL} -d in our build process. If INSTALL is set to

"install -C" then things will fail due to new checks.  Relax the
checks so that install -C -d works again.

usr.bin/xinstall/xinstall.c

@@ -169,7 +169,7 @@ main(argc, argv)
 	argv += optind;
 
 	/* some options make no sense when creating directories */
-	if ((safecopy || docompare || dostrip) && dodir)
+	if (dostrip && dodir)
 		usage();
 
 	/* must have at least two arguments, except when creating directories */