Fix a warning in the GTK+ build.
Fix a warning in the GTK+ build.

Reviewed by Gustavo Noronha Silva.

No new tests. This should not change behavior.

* plugins/gtk/PluginViewGtk.cpp:
(WebCore::PluginView::platformStart): Use reinterpet_cast to convert X11 Windows into void pointers.

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@106159 bbb929c8-8fbe-4397-9dbb-9b2b20218538
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