Rework glr.c slightly to avoid gcc -Wtraditional warnings.

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+2003-08-04  Paul Eggert  <eggert@twinsun.com>
+
+       Rework code slightly to avoid gcc -Wtraditional warnings.
+       * data/glr.c (yyuserMerge): Return void, not YYSTYPE.
+       The returned value is now stored in *YY0.  All callers changed.
+       * src/output.c (merge_output): Adjust to the above change.
+
 2003-07-26  Paul Eggert  <eggert@twinsun.com>
 
        * data/glr.c (YYASSERT): New macro.