wx.EmptyBitmap can be called with a wx.Size (or a 2-element sequence)
object too. Similar changes were done for wx.Image as well.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@26792 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
then just default in BLACK to simulate the default (monobitmap)
behaviour. It's too tricky to make true monochome bitmaps in a
platform independent way from the Python wrappers.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@25787 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
