PR libfortran/62296

	* intrinsics/execute_command_line.c (EXEC_INVALIDCOMMAND): New
	error code.
	(cmdmsg_values): New error message.
	(set_cmdstat): Rework runtime error.
	(execute_command_line): Handle invalid command line error status.

	* gfortran.dg/execute_command_line_2.f90: New test.

From-SVN: r227105