Add wxRendererNative::DrawGauge() method.

Add the method with the native implementations for MSW and OS X and a generic
version fallback.

Closes #16406.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77023 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775