WIN32: Move utility functions to a common wrapper

backends/platform/sdl/win32/win32_wrapper.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program 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 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef PLATFORM_SDL_WIN32_WRAPPER_H
+#define PLATFORM_SDL_WIN32_WRAPPER_H
+
+// Helper functions
+namespace Win32 {
+
+/**
+ * Checks if the current running Windows version is greater or equal to the specified version.
+ * See: https://docs.microsoft.com/en-us/windows/desktop/sysinfo/operating-system-version
+ *
+ * @param majorVersion The major version number (x.0)
+ * @param minorVersion The minor version number (0.x)
+ */
+bool confirmWindowsVersion(int majorVersion, int minorVersion);
+/**
+ * Converts a C string into a Windows wide-character string.
+ * Used to interact with Win32 Unicode APIs with no ANSI fallback.
+ *
+ * @param s Source string
+ * @return Converted string
+ *
+ * @note Return value must be freed by the caller.
+ */
+wchar_t *ansiToUnicode(const char *s);
+
+}
+
+#endif