fix(utils): add missing fs file

include/linphone/utils/fs.h

@@ -0,0 +1,38 @@
+/*
+ * fs.h
+ * Copyright (C) 2010-2017 Belledonne Communications SARL
+ *
+ * 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 _L_FS_H_
+#define _L_FS_H_
+
+#include <string>
+
+#include "linphone/utils/general.h"
+
+// =============================================================================
+
+LINPHONE_BEGIN_NAMESPACE
+
+namespace Fs {
+	// Copy one file to other destination. Return true on success.
+	LINPHONE_PUBLIC bool copy (const std::string &srcPath, const std::string &destPath);
+}
+
+LINPHONE_END_NAMESPACE
+
+#endif // ifndef _L_FS_H_