microtar: Update to latest upstream commit

This is a major overhaul of the library with some API
changes and ease of use improvements, particularly for
creating new archives.

The updated functionality is intended to support a new
X1000 installer framework.

Change-Id: Icf192bb546831231d49303fbf529ef1c1ce8905c

lib/microtar/src/microtar-stdio.h

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2017 rxi
+ * Copyright (c) 2021 Aidan MacDonald
+ *
+ * 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 MICROTAR_STDIO_H
+#define MICROTAR_STDIO_H
+
+#include "microtar.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int mtar_open(mtar_t* tar, const char* filename, const char* mode);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif