Adding use_system_libusb option for third_party/libusb

third_party/libusb/examples/lsusb.c

Index: third_party/libusb/examples/lsusb.c
diff --git a/third_party/libusb/examples/lsusb.c b/third_party/libusb/examples/lsusb.c
deleted file mode 100644
index 6ab891725a36424a7f59d5a8ff2c20a7deaec858..0000000000000000000000000000000000000000
--- a/third_party/libusb/examples/lsusb.c
+++ /dev/null
@@ -1,64 +0,0 @@
-/*
- * libusb example program to list devices on the bus
- * Copyright (C) 2007 Daniel Drake <dsd@gentoo.org>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include <stdio.h>
-#include <sys/types.h>
-
-#include <libusb.h>
-
-static void print_devs(libusb_device **devs)
-{
-	libusb_device *dev;
-	int i = 0;
-
-	while ((dev = devs[i++]) != NULL) {
-		struct libusb_device_descriptor desc;
-		int r = libusb_get_device_descriptor(dev, &desc);
-		if (r < 0) {
-			fprintf(stderr, "failed to get device descriptor");
-			return;
-		}
-
-		printf("%04x:%04x (bus %d, device %d)\n",
-			desc.idVendor, desc.idProduct,
-			libusb_get_bus_number(dev), libusb_get_device_address(dev));
-	}
-}
-
-int main(void)
-{
-	libusb_device **devs;
-	int r;
-	ssize_t cnt;
-
-	r = libusb_init(NULL);
-	if (r < 0)
-		return r;
-
-	cnt = libusb_get_device_list(NULL, &devs);
-	if (cnt < 0)
-		return (int) cnt;
-
-	print_devs(devs);
-	libusb_free_device_list(devs, 1);
-
-	libusb_exit(NULL);
-	return 0;
-}
-