2. setup.h will be automatically updated/recreated when needed (due to
automake stupidness I have to create the real setup.h in the top level
build directory now)
3. wx-config --cflags gives -I@prefix@/include only once, not twice
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2647 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775