Mock out mgos_i2c.h to work with Linux.

include/mgos.h

@@ -0,0 +1,14 @@
+#ifndef __MGOS_H
+#define __MGOS_H
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "mgos_mock.h"
+
+#endif // __MGOS_H