Copy getopt.h from old common/win/my_getopt-1.5/my_getopt

This patch completes the copy from
4d8f39020a which missed this file.

client/windows/getopt.h

@@ -0,0 +1,56 @@
+/*
+ *  getopt.h - cpp wrapper for my_getopt to make it look like getopt.
+ *  Copyright 1997, 2000, 2001, 2002, Benjamin Sittler
+ *
+ *  Permission is hereby granted, free of charge, to any person
+ *  obtaining a copy of this software and associated documentation
+ *  files (the "Software"), to deal in the Software without
+ *  restriction, including without limitation the rights to use, copy,
+ *  modify, merge, publish, distribute, sublicense, and/or sell copies
+ *  of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be
+ *  included in all copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *  NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ *  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ *  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ *  DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef MY_WRAPPER_GETOPT_H_INCLUDED
+#define MY_WRAPPER_GETOPT_H_INCLUDED
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "my_getopt.h"
+
+#undef getopt
+#define getopt my_getopt
+#undef getopt_long
+#define getopt_long my_getopt_long
+#undef getopt_long_only
+#define getopt_long_only my_getopt_long_only
+#undef _getopt_internal
+#define _getopt_internal _my_getopt_internal
+#undef opterr
+#define opterr my_opterr
+#undef optind
+#define optind my_optind
+#undef optopt
+#define optopt my_optopt
+#undef optarg
+#define optarg my_optarg
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* MY_WRAPPER_GETOPT_H_INCLUDED */