COMP: backport of updates for gcc-92 compilation

applications/utilities/mesh/generation/foamyMesh/conformalVoronoiMesh/conformalVoronoiMesh/indexedVertex/indexedVertex.H

@@ -144,6 +144,13 @@ public:
         typedef indexedVertex<Gt,Vb2>                           Other;
     };
 
+
+    // Generated Methods
+
+        //- Copy construct
+        indexedVertex(const indexedVertex&) = default;
+
+
     // Constructors
 
         inline indexedVertex();