reverted the fix for Unicode compilation with VC++ as it breaks other ports (and shouldn't be necessary anyhow)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@11823 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/dynlib.cpp

@@ -255,7 +255,7 @@ wxDllLoader::LoadLibrary(const wxString & libname, bool *success)
     char zError[256] = "";
     wxDllOpen(zError, libname, handle);
 #else // !Mac
-    handle = wxDllOpen(libname.c_str());
+    handle = wxDllOpen(libname);
 #endif // OS
 
     if ( !handle )