two changes and some cleanup:

1. DECLARE_ABSTRACT_CLASS() shouldn't declare wxCreateObject() (which is not
   defined by IMPLEMENT_ABSTRACT_CLASS())
2. don't make GetClassInfo() declaration inside DECLARE_CLASS inline in an
   attempt to fix linking problems with HP-UX compiler

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@31775 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775