Suppress 'unused argument' warnings

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62948 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/window.cpp

@@ -4755,6 +4755,11 @@ wxColour wxWindowMSW::MSWGetThemeColour(const wchar_t *themeName,
                 themeName, themePart, themeState, themeProperty),
             hr);
     }
+#else
+    wxUnusedVar(themeName);
+    wxUnusedVar(themePart);
+    wxUnusedVar(themeState);
+    wxUnusedVar(themeColour);
 #endif
     return wxSystemSettings::GetColour(fallback);
 }