reverted wxHVScrolledWindow patch (rev 1.19/1.21 of vscroll.h/.cpp) because not only we don't want to duplicate code like this but it also broke wxHtmlListBox by making scrolling in it O(N) instead of O(1)
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@38715 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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