gripe: variable arg lists

[M. J. Shannon, Jr.]

But there is a standard method of dealing with variable argument lists.
	#include <varargs.h>
The contents of the file differ from machine to machine, but the `entry points'
are standard.

As to why _doprnt() was used: that's pretty easy.  There is no standard
analog to printf which accepts a variable argument list *as an argument*.

	Marty Shannon
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