fdo#75757: remove inheritance to std::vector

Glyphs::iterator_pair_t was gone at df3c7e76.

Change-Id: I471a2ef659dd98527d2dca5fd8c3741851341ec5
Reviewed-on: https://gerrit.libreoffice.org/11533Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

vcl/inc/graphite_layout.hxx

@@ -87,13 +87,7 @@ private:
 class VCL_PLUGIN_PUBLIC GraphiteLayout : public SalLayout
 {
 public:
-
-    class Glyphs : public std::vector<GlyphItem>
-    {
-    public:
-        typedef std::pair<Glyphs::const_iterator, Glyphs::const_iterator> iterator_pair_t;
-
-    };
+    typedef std::vector<GlyphItem> Glyphs;
 
     mutable Glyphs          mvGlyphs;
     void clear();