HAL_Linux: added missing Util.cpp

libraries/AP_HAL_Linux/Util.cpp

@@ -0,0 +1,23 @@
+#include <AP_HAL.h>
+#if CONFIG_HAL_BOARD == HAL_BOARD_LINUX
+#include <stdio.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+
+extern const AP_HAL::HAL& hal;
+
+#include "Util.h"
+using namespace Linux;
+
+/**
+   return commandline arguments, if available
+*/
+void LinuxUtil::commandline_arguments(uint8_t &argc, char * const *&argv)
+{
+    argc = saved_argc;
+    argv = saved_argv;
+}
+
+#endif // CONFIG_HAL_BOARD == HAL_BOARD_LINUX