Add new definitions required by MinGW for webview. Re-enable custom schemes as a result.

See #13509

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@69292 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/webview_ie.cpp

@@ -665,7 +665,6 @@ void wxWebViewIE::RunScript(const wxString& javascript)
 
 void wxWebViewIE::RegisterHandler(wxSharedPtr<wxWebViewHandler> handler)
 {
-#ifndef __MINGW32__
     wxDynamicLibrary urlMon(wxT("urlmon.dll"));
     if(urlMon.HasSymbol(wxT("CoInternetGetSession")))
     {
@@ -690,7 +689,6 @@ void wxWebViewIE::RegisterHandler(wxSharedPtr<wxWebViewHandler> handler)
     {
         wxFAIL_MSG("urlmon does not contain CoInternetGetSession");
     }
-#endif
 }
 
 bool wxWebViewIE::CanExecCommand(wxString command) const
@@ -977,8 +975,6 @@ void wxWebViewIE::onActiveXEvent(wxActiveXEvent& evt)
     evt.Skip();
 }
 
-#ifndef __MINGW32__
-
 VirtualProtocol::VirtualProtocol(wxSharedPtr<wxWebViewHandler> handler)
 {
     m_refCount = 0;
@@ -1148,6 +1144,4 @@ ULONG ClassFactory::Release(void)
 
 } 
 
-#endif // __MINGW32__
-
 #endif // wxUSE_WEBVIEW && wxUSE_WEBVIEW_IE