Add wxUSE_MARKUP and wrap SetLabelMarkup() in it.

Make it possible to disable all the new markup-related code by setting
wxUSE_MARKUP to 0 in setup.h or using configure --disable-markup option.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67062 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/stattext.cpp

@@ -133,6 +133,8 @@ void wxStaticText::SetLabel(const wxString& label)
     GTKDoSetLabel(&wxStaticText::GTKSetLabelForLabel, label);
 }
 
+#if wxUSE_MARKUP
+
 bool wxStaticText::DoSetLabelMarkup(const wxString& markup)
 {
     const wxString stripped = RemoveMarkup(markup);
@@ -146,6 +148,8 @@ bool wxStaticText::DoSetLabelMarkup(const wxString& markup)
     return true;
 }
 
+#endif // wxUSE_MARKUP
+
 bool wxStaticText::SetFont( const wxFont &font )
 {
     const bool wasUnderlined = GetFont().GetUnderlined();