yyerror: update to POSIX standard

To comply with the latest POSIX standard, in Yacc compatibility mode
(options `-y`/`--yacc`) Bison now generates prototypes for yyerror and
yylex.  In some situations, this is breaking compatibility: if the user
has already declared these functions but with some differences (e.g., to
declare them as static, or to use specific attributes), the generated
parser will fail to compile.  To disable these prototypes, #define yyerror
(to `yyerror`), and likewise for yylex.

refer: https://git.savannah.gnu.org/cgit/bison.git/tree/NEWS

GNU Bison 3.8

lib/com_err/parse.y

@@ -35,7 +35,8 @@
 #include "compile_et.h"
 #include "lex.h"
 
-void yyerror (char *s);
+void yyerror (const char *s);
+#define yyerror yyerror
 static long name2number(const char *str);
 
 extern char *yytext;
@@ -168,7 +169,7 @@ name2number(const char *str)
 }
 
 void
-yyerror (char *s)
+yyerror (const char *s)
 {
      _lex_error_message ("%s\n", s);
 }