Rather than waste my time debugging tsort, I found a old "ucb" version
with archie;  I compile that one and it worked fine.  Now cc builds fine.

the two tsorts are very different; the one I found has an id:

	static char *sccsid = "@(#)tsort.c      4.2 (Berkeley) 10/20/82";

[n.b. I tried to current-netbsd tsort running on a sparc/sunos;  aside from the
different behavior of realloc(), it also looped given the same input file]

-brad

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