glr.cc: fix: use symbol_name

[Akim Demaille]

commit 3add9ffbdea4c8dfbab3a3a557837ce445ba9fe3
Author: Akim Demaille <akim.demai...@gmail.com>
Date:   Sat Sep 26 14:32:25 2020 +0200

    glr.cc: fix: use symbol_name
    
    * data/skeletons/glr.cc: here.

diff --git a/data/skeletons/glr.cc b/data/skeletons/glr.cc
index 8e4878f7..e23702ca 100644
--- a/data/skeletons/glr.cc
+++ b/data/skeletons/glr.cc
@@ -172,7 +172,7 @@ m4_pushdef([b4_parse_param], 
m4_defn([b4_parse_param_orig]))dnl
                            const location_type* yylocationp]])[) const
   {
     *yycdebug_ << (yykind < YYNTOKENS ? "token" : "nterm")
-               << ' ' << yytname[yykind] << " ("]b4_locations_if([[
+               << ' ' << yysymbol_name (yykind) << " ("]b4_locations_if([[
                << *yylocationp << ": "]])[;
     yy_symbol_value_print_ (yykind, yyvaluep]b4_locations_if([[, 
yylocationp]])[);
     *yycdebug_ << ')';