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Delete some useless setlocale(3) calls in /usr/bin, no functional change.
Patches from Jan Stary <hans at stare dot cz>, tweaked by me and tb@.
While here, apply some simple style improvements:
Sort headers, static void __dead usage(), return from main(),
zap case '?', drop /* NOTREACHED */, drop break after usage(), ...
OK tb@ millert@

/*	$OpenBSD: uname.c,v 1.19 2016/10/28 07:22:59 schwarze Exp $	*/

/*
 * Copyright (c) 1994 Winning Strategies, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Winning Strategies, Inc.
 * 4. The name of Winning Strategies, Inc. may not be used to endorse or
 *    promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/param.h>	/* MACHINE_ARCH */
#include <sys/utsname.h>

#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

static void __dead usage(void);

#define	PRINT_SYSNAME		0x01
#define	PRINT_NODENAME		0x02
#define	PRINT_RELEASE		0x04
#define	PRINT_VERSION		0x08
#define	PRINT_MACHINE		0x10
#define	PRINT_ALL		0x1f
#define PRINT_MACHINE_ARCH	0x20

int
main(int argc, char *argv[])
{
	struct utsname u;
	int c;
	int space = 0;
	int print_mask = 0;

	if (pledge("stdio", NULL) == -1)
		err(1, "pledge");

	while ((c = getopt(argc, argv, "amnrsvp")) != -1 ) {
		switch (c) {
		case 'a':
			print_mask |= PRINT_ALL;
			break;
		case 'm':
			print_mask |= PRINT_MACHINE;
			break;
		case 'n':
			print_mask |= PRINT_NODENAME;
			break;
		case 'p':
			print_mask |= PRINT_MACHINE_ARCH;
			break;
		case 'r':
			print_mask |= PRINT_RELEASE;
			break;
		case 's':
			print_mask |= PRINT_SYSNAME;
			break;
		case 'v':
			print_mask |= PRINT_VERSION;
			break;
		default:
			usage();
		}
	}

	if (optind != argc)
		usage();

	if (!print_mask)
		print_mask = PRINT_SYSNAME;

	if (uname(&u) == -1)
		err(1, NULL);

	if (print_mask & PRINT_SYSNAME) {
		space++;
		fputs(u.sysname, stdout);
	}
	if (print_mask & PRINT_NODENAME) {
		if (space++)
			putchar(' ');

		fputs(u.nodename, stdout);
	}
	if (print_mask & PRINT_RELEASE) {
		if (space++)
			putchar(' ');

		fputs(u.release, stdout);
	}
	if (print_mask & PRINT_VERSION) {
		if (space++)
			putchar(' ');

		fputs(u.version, stdout);
	}
	if (print_mask & PRINT_MACHINE) {
		if (space++)
			putchar(' ');

		fputs(u.machine, stdout);
	}
	if (print_mask & PRINT_MACHINE_ARCH) {
		if (space++)
			putchar(' ');

		fputs(MACHINE_ARCH, stdout);
	}
	putchar('\n');

	return 0;
}

static void __dead
usage(void)
{
	fprintf(stderr, "usage: uname [-amnprsv]\n");
	exit(1);
}