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    routine file_utimes (
    	utimes_file: file_t;
    	RPT
    	new_atime: time_value_t;
    	new_mtime: time_value_t);

Change access and modify times.

If the microseconds value is -1 (all bits on) then the time should be set to
the current time and the remainder of the `time_value_t` ignored.