[CpmlPrimitive] Enable close path rendering to cairo
[CpmlPrimitive] Enable close path rendering to cairo

A lonely CAIRO_PATH_CLOSE_PATH is not renderable, so it must
be treated separately in cpml_primitive_to_cairo(). Now it is
converted to a line-to primitive from the origin to the
first point of the source segment.

ntd/adg,ntd/adg