Add white outline to bulls eye cursor used under MSW.

Add white outline to bulls eye cursor used under MSW.

The cursor used black circles only making it perfectly invisible on black
background. Add a white outline as well to ensure that it can be seen in this
case too, similarly to how it's done for magnifying glass cursor and the same
bulls eye cursor in GTK+.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63693 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775