Add mf_nonce_brute from https://github.com/iceman1001/mf_nonce_brute and merge to pm3 Makefile

tools/mf_nonce_brute/sleep.c

@@ -0,0 +1,28 @@
+//-----------------------------------------------------------------------------
+// Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
+//
+// This code is licensed to you under the terms of the GNU GPL, version 2 or,
+// at your option, any later version. See the LICENSE.txt file for the text of
+// the license.
+//-----------------------------------------------------------------------------
+// platform-independant sleep macros
+//-----------------------------------------------------------------------------
+
+#ifndef _WIN32
+
+#define _POSIX_C_SOURCE	199309L
+#include "sleep.h"
+#include <time.h>
+#include <stdio.h>
+#include <sys/time.h>
+#include <errno.h>
+
+void nsleep(uint64_t n) {
+    struct timespec timeout;
+    timeout.tv_sec = n / 1000000000;
+    timeout.tv_nsec = n % 1000000000;
+    while (nanosleep(&timeout, &timeout) && errno == EINTR);
+}
+
+#endif // _WIN32
+