plotutils SVG fix

[Phil Endecott]

Hi,

I thought you ought to know about a minor bug in the plotutils code
for outputting SVG.  It outputs "fill-rule:even-odd" but it should
say "fill-rule:evenodd", i.e. without the - in evenodd.  Here is the
URL of the definitive W3C spec:

http://www.w3.org/TR/SVG/painting.html#FillRuleProperty

I have plotutils 2.4.1.  I believe that the fix is just the obvious change
to libplot/s_closepl.c.  It is correct in s_path.c (see _svg_fill_style).

Thanks for this great code, which I am using as part of pstoedit.  With
this fix the SVG that is generated works fine with Batik and Fop, two
xml.apache.org tools.

--Phil.