removed wxUSE_PENWINDOWS (and its misspellings), it didn't work and wasn't used/defined

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@35097 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/app.cpp

@@ -308,10 +308,6 @@ bool wxApp::Initialize(int& argc, wxChar **argv)
 
     RegisterWindowClasses();
 
-#if wxUSE_PENWINDOWS
-    wxRegisterPenWin();
-#endif
-
     wxWinHandleHash = new wxWinHashTable(wxKEY_INTEGER, 100);
 
 #if !defined(__WXMICROWIN__) && !defined(__WXWINCE__)