Externals: Update libusb to version 1.0.20

Externals/libusb/libusb/descriptor.c

@@ -19,6 +19,8 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include <config.h>
+
 #include <errno.h>
 #include <stdint.h>
 #include <stdlib.h>
@@ -453,7 +455,7 @@ static int parse_configuration(struct libusb_context *ctx,
 					(header.bDescriptorType == LIBUSB_DT_DEVICE))
 				break;
 
-			usbi_dbg("skipping descriptor 0x%x\n", header.bDescriptorType);
+			usbi_dbg("skipping descriptor 0x%x", header.bDescriptorType);
 			buffer += header.bLength;
 			size -= header.bLength;
 		}