Merge branch 'maint'

* maint:
  maint: post-release administrivia
  version 3.3.1
  yacc: issue warnings, not errors, for Bison extensions
  style: formatting changes in NEWS and complain.c
  tests: don't depend on the user's definition of SHELL

src/getargs.c

@@ -708,7 +708,7 @@ getargs (int argc, char *argv[])
         break;
 
       case 'y':
-        warning_argmatch ("error=yacc", 0, 6);
+        warning_argmatch ("yacc", 0, 0);
         yacc_loc = command_line_location ();
         break;