make token stacks to work with c++ compiler

[Coe, Rich (MED)]

The following patch reverts a change which was made sometime after 
bison-1.28.  Without this patch, when the bison output is compiled 
with a c++ compiler, it prevents the token stack from growing beyond its
initial size. 

This change is made against yacc.c (1.54), which is the latest version 
available in the CVS repository.

Tested on gcc-2.95.3 and gcc-3.2, with all tests passing.

*** bison/data/yacc.c-1.54      Wed Apr  2 16:25:02 2003
--- bison/data/yacc.c   Wed Apr  2 16:25:23 2003
***************
*** 247,254 ****
  
  
  #if (! defined (yyoverflow) \
!      && (! defined (__cplusplus) \
!        || (]b4_location_if([YYLTYPE_IS_TRIVIAL && ])[YYSTYPE_IS_TRIVIAL)))
  
  /* A type that is properly aligned for any stack member.  */
  union yyalloc
--- 247,253 ----
  
  
  #if (! defined (yyoverflow) \
!      && (]b4_location_if([YYLTYPE_IS_TRIVIAL && ])[YYSTYPE_IS_TRIVIAL))
  
  /* A type that is properly aligned for any stack member.  */
  union yyalloc

--
Rich Coe                address@hidden
General Electric Medical Systems