tests: AT_YYERROR_DEFINE: prepare for list of ints.

* tests/local.at (AT_YYERROR_DEFINE): Don't add quotes, check their
presence to detect char/int types.
* tests/actions.at, tests/conflicts.at, tests/glr-regression.at,
* tests/push.at, tests/regression.at: Adjust.

tests/conflicts.at

@@ -491,7 +491,7 @@ reduce-nonassoc: %prec 'a';
 
 %%
 ]AT_YYERROR_DEFINE[
-]AT_YYLEX_DEFINE([aaa])[
+]AT_YYLEX_DEFINE(["aaa"])[
 
 int
 main (void)