Allow building wxGTK using GTK+3 under Windows too.

No real changes, just use the right libraries for GTK+3 port.

Closes #15871.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75585 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -19,6 +19,10 @@ All (GUI):
 - Add wxHtmlWindow::SetDefaultHTMLCursor() (Jeff A. Marr).
 - Add default ctor and Create() to wxContextHelpButton (Hanmac).
 
+wxGTK:
+
+- Support building wxGTK3 under Windows (Kolya Kosenko).
+
 wxMSW:
 
 - Make wxFILTER_INCLUDE_LIST in wxTextValidator actually usable.