GetGlyphData is only used by GetGlyphMetric so can be private

Change-Id: I744a43c461a2ed1e404187afeaf25b6265d2570a
Reviewed-on: https://gerrit.libreoffice.org/31109Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

vcl/inc/unx/glyphcache.hxx

@@ -168,7 +168,6 @@ public:
     const FontCharMapRef    GetFontCharMap() const;
     bool                    GetFontCapabilities(vcl::FontCapabilities &) const;
 
-    GlyphData&              GetGlyphData( sal_GlyphId );
     const GlyphMetric&      GetGlyphMetric( sal_GlyphId aGlyphId )
                             { return GetGlyphData( aGlyphId ).GetMetric(); }
 
@@ -202,6 +201,7 @@ private:
 
     void                    ApplyGlyphTransform( int nGlyphFlags, FT_GlyphRec_* ) const;
     void                    ApplyGSUB( const FontSelectPattern& );
+    GlyphData&              GetGlyphData( sal_GlyphId );
 
     ServerFontLayoutEngine* GetLayoutEngine();