WrapClientServer: fix export macro usage
This is an unconditional export. VTK_EXPORT
is sensitive to whether
VTK is built as static or shared; these uses should not be tied to that
as they are separate decisions.
Additionally, use VTK_ABI_HIDDEN
to hide symbols which are only called
from the entry point; there's no need to call them from outside of the
hosting library. Other functions may be marked static
as they are not
used outside of the file in question.
Edited by Ben Boeckel