Possible fix for Windows bug #2213362

[Ethan M. <merritt@u.washington.edu>]

The win terminal Bug

 2213362  	 win.trm: Extra line from end of graph to key sample

has been with us since 4.2.4.  I really want to get this fixed before
putting out a 4.4-rc1.

Could somebody with a Windows build system please test whether the 
attachd patch cures it?

In a nutshell, if a line plot connects exactly 199 points (polymax - 1)
then an extra line is drawn.   Simple test case:

set term win
set key left
set samples 199
plot x

		thanks in advance for any assistance,

				Ethan