Support Unicode module names in wxDynamicLibrary::MSWGetModuleHandle().

The module names are not necessarily ASCII strings, so use wxString instead of
"char*" and W-version of GetModuleHandle() if appropriate.

See #15138.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73792 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/dynlib.h

@@ -359,7 +359,7 @@ public:
     // the returned handle reference count is not incremented so it doesn't
     // need to be freed using FreeLibrary() but it also means that it can
     // become invalid if the DLL is unloaded
-    static WXHMODULE MSWGetModuleHandle(const char *name, void *addr);
+    static WXHMODULE MSWGetModuleHandle(const wxString& name, void *addr);
 #endif // __WINDOWS__
 
 protected: