Compilation fixes for wxMSW in wxUSE_STL=1 build.

Add explicit conversions from wxString to wchar_t* as they don't happen
implicitly when wxUSE_STL=1.

Closes #13715.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@69911 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/graphics.cpp

@@ -899,7 +899,7 @@ wxGDIPlusFontData::Init(const wxString& name,
                         const wxColour& col,
                         Unit fontUnit)
 {
-    m_font = new Font(name, size, style, fontUnit);
+    m_font = new Font(name.wc_str(), size, style, fontUnit);
 
     m_textBrush = new SolidBrush(wxColourToColor(col));
 }