Make-lang.in (f77.stage?): Use mv -f instead of just mv so that we can move g77.c.

Make-lang.in (f77.stage?): Use mv -f instead of just mv so that we can move g77.c.

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	* Make-lang.in (f77.stage?): Use mv -f instead of just mv so that
	we can move g77.c.

From-SVN: r20957