Use Winapi on both cygwin and mingw32 to share more code between both.

include/grub/util/windows.h

@@ -0,0 +1,30 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_WINDOWS_UTIL_HEADER
+#define GRUB_WINDOWS_UTIL_HEADER	1
+
+#include <windows.h>
+
+LPTSTR
+grub_util_get_windows_path (const char *unix_path);
+
+char *
+grub_util_tchar_to_utf8 (LPCTSTR in);
+
+#endif