Remove never used ALL_WX_LIBS variable from configure.

It wasn't up to date (e.g. aui, ribbon, propgrid, richtext were not included
in it) and wasn't used anywhere anyhow.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75282 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775