Windows build of wgnuplot.exe

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

Is there a reason why the windows binary on SourceForge does not
know about transparent fill styles?

E.g.
gnuplot>  set style fill transparent solid 0.5
                          ^
                         ';' expected

This code was added back in November 2006, and even if the windows
terminal itself doesn't support transparency (does it?) it should
still be available for PNG, SVG, and other terminals.  If the
object file for misc.c hasn't been rebuilt since 2006 I am surprised
the program works at all!

-- 
Ethan A Merritt