mesa/vbo: use _lookup_prim_by_nr for debugging

Switch over to specialized enum lookup for primitives

src/mesa/vbo/vbo_exec_draw.c

@@ -50,7 +50,7 @@ static void vbo_exec_debug_verts( struct vbo_exec_context *exec )
       struct _mesa_prim *prim = &exec->vtx.prim[i];
       _mesa_printf("   prim %d: %s%s %d..%d %s %s\n",
 		   i, 
-		   _mesa_lookup_enum_by_nr(prim->mode),
+		   _mesa_lookup_prim_by_nr(prim->mode),
 		   prim->weak ? " (weak)" : "",
 		   prim->start, 
 		   prim->start + prim->count,

src/mesa/vbo/vbo_save_api.c

@@ -1148,7 +1148,7 @@ static void vbo_print_vertex_list( GLcontext *ctx, void *data )
       struct _mesa_prim *prim = &node->prim[i];
       _mesa_debug(NULL, "   prim %d: %s%s %d..%d %s %s\n",
 		  i, 
-		  _mesa_lookup_enum_by_nr(prim->mode),
+		  _mesa_lookup_prim_by_nr(prim->mode),
 		  prim->weak ? " (weak)" : "",
 		  prim->start, 
 		  prim->start + prim->count,

src/mesa/vbo/vbo_save_loopback.c

@@ -97,7 +97,7 @@ static void loopback_prim( GLcontext *ctx,
 
    if (0)
       _mesa_printf("loopback prim %s(%s,%s) verts %d..%d\n",
-		   _mesa_lookup_enum_by_nr(prim->mode),
+		   _mesa_lookup_prim_by_nr(prim->mode),
 		   prim->begin ? "begin" : "..",
 		   prim->end ? "end" : "..",
 		   start, 

src/mesa/vbo/vbo_split_copy.c

@@ -180,7 +180,7 @@ static void begin( struct copy_context *copy, GLenum mode, GLboolean begin_flag
 {
    struct _mesa_prim *prim = &copy->dstprim[copy->dstprim_nr];
 
-/*    _mesa_printf("begin %s (%d)\n", _mesa_lookup_enum_by_nr(mode), begin_flag); */
+/*    _mesa_printf("begin %s (%d)\n", _mesa_lookup_prim_by_nr(mode), begin_flag); */
 		
    prim->mode = mode;
    prim->begin = begin_flag;