We need to include wx/defs.h that (indirectly) defines wxUSE_RADIOBOX before testing for it in wx/radiobox.h, otherwise the test may fail if the latter header is the first wx header included by the user code. This is similar to r65210 fix for wxUSE_CHECKLISTBOX. Closes #12526. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65668 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775