Make SME prop-grid hack Mac-only.

Fixes https://gitlab.com/kicad/code/kicad/issues/13852

eeschema/sim/sim_property.cpp

@@ -145,11 +145,12 @@ bool SIM_STRING_PROPERTY::OnEvent( wxPropertyGrid* propgrid, wxWindow* wnd_prima
         }
     }
 
+#ifdef __WXMAC__
     if( wxPropertyGrid* propGrid = dynamic_cast<wxPropertyGrid*>( wnd_primary->GetParent() ) )
     {
-        // This doesn't seem like it should be required, as wxPGTextCtrlEditor::OnTextCtrlEvent()
-        // should be setting the value to modified.  But it doesn't (or the modified flag is
-        // cleared at some point later), and even if it is set, the changes don't get committed.
+        // This shouldn't be required, as wxPGTextCtrlEditor::OnTextCtrlEvent() should be setting
+        // the value to modified.  But it doesn't on Mac (or the modified flag is cleared at some
+        // point later), and even if it is set, the changes don't get committed.
         // (We used to have code in DIALOG_SIM_MODEL to commit things on *some* actions, but it
         // wasn't complete and this appears to have at least a better hit rate.)
         propGrid->CallAfter(
@@ -159,6 +160,7 @@ bool SIM_STRING_PROPERTY::OnEvent( wxPropertyGrid* propgrid, wxWindow* wnd_prima
                     propGrid->CommitChangesFromEditor();
                 } );
     }
+#endif
 
     return false;
 }