ADD: num_CPUs(void) method from pm3 master

CHG: clean up in util.c
ADD: seems like mingw doesn't have scandir. Had to add one. *untested*

client/scandir.h

@@ -0,0 +1,23 @@
+//-----------------------------------------------------------------------------
+// Copyright (C) 2017 iceman <iceman at iuse.se>
+//
+// 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 SCANDIR_H__
+#define SCANDIR_H__
+
+#include <dirent.h>
+#include <stdlib.h>
+
+#ifdef _WIN32
+#else
+#endif // _WIN32
+
+extern int scandir (const char *dir, struct dirent ***namelist, int (*select) (const struct dirent *), int (*compar) (const struct dirent **, const struct dirent **));
+extern int alphasort (const struct dirent **a, const struct dirent **b);
+#endif // SCANDIR_H__