removed wxUSE_TOOLBAR_SIMPLE leftovers from the main sources, it's not used anywhere anymore

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@40766 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/chkconf.h

@@ -1623,15 +1623,6 @@
 #            define wxUSE_TOOLBAR_NATIVE 0
 #        endif
 #   endif
-
-#   if wxUSE_TOOLBAR_SIMPLE
-#        ifdef wxABORT_ON_CONFIG_ERROR
-#            error "wxUSE_TOOLBAR is set to 0 but wxUSE_TOOLBAR_SIMPLE is set to 1"
-#        else
-#            undef wxUSE_TOOLBAR_SIMPLE
-#            define wxUSE_TOOLBAR_SIMPLE 0
-#        endif
-#   endif
 #endif
 
 #if !wxUSE_IMAGLIST