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compile warnings about copying loop variable


I get a lot of compile warnings like this:

In file included from /Users/lijon/Coding/kicad/include/dialog_shim.h:29:
/Users/lijon/Coding/kicad/include/hashtables.h:87:26: warning: loop
variable 'c' is always a copy because the range of type 'const
wxString' does not return a reference
        for( const auto& c : aString )
/Users/lijon/Coding/kicad/include/hashtables.h:87:14: note: use
non-reference type 'wxUniChar'
        for( const auto& c : aString )


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