GDK Patch

[Donald R Willhoit <willhoit+ andrew cmu edu>]

I just uploaded a patch to ftp.gimp.org to add comprehensive support for
bezier curves to the GDK.  Hopefully I did everything right as this is
my first contribution to it.  I also fix the polygon code which when a
polygon (non-filled) was not closed would incorrectly just draw a line
between the two vertices, but as I understand from the XDrawLine and
XDrawLines man pages this won't properly join the lines (miter, bevel,
round).  So I fixed this but it incurred extra overhead :(  Does it
really need to handle the special case where the person didn't include
the first point as the last?  I think it'd be better for efficiency if
it was just ditched.

Later
Ryan Willhoit <willhoit@andrew.cmu.edu>