Allow for older GTK+ versions


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74289 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
using dc Create for bitmap, for retina support

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74290 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775