Clang: Remove faulty copy constructor of HighlightingInformationsIterator

The test HighlightingInformations.ForFullTranslationUnitRange crashed on
Windows because of this.

Change-Id: I6dbf1e1ce127fedceccea92afe7c59c1d6a90db7
Reviewed-by: Marco Bubke <marco.bubke@theqtcompany.com>

src/tools/clangbackend/ipcsource/highlightinginformationsiterator.h

@@ -56,10 +56,6 @@ public:
           cxTranslationUnit(cxTranslationUnit)
     {}
 
-    HighlightingInformationsIterator(const HighlightingInformationsIterator &other)
-        : cxCursorIterator(other.cxCursorIterator)
-    {}
-
     HighlightingInformationsIterator& operator++()
     {
         ++cxCursorIterator;