1. wxLoad/SaveFileSelector return "wxString" instead of "char *"

2. WXDLLEXPORT was misplaced in a couple of places (hopefully my chanegs won't
   break compilation for other compilers)
3. Some VC++ warnings suppressed in socket code


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@1464 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/app.cpp

@@ -260,7 +260,7 @@ bool wxApp::Initialize()
 
     // This is to foil optimizations in Visual C++ that
     // throw out dummy.obj.
-#if defined(_MSC_VER) && !defined(WXMAKINGDLL)
+#if 0 && defined(_MSC_VER) && !defined(WXMAKINGDLL)
     extern char wxDummyChar;
     if (wxDummyChar) wxDummyChar++;
 #endif