C++ and casts

[Bruce Lilly]

Santa Claus asked me to forward the attached patch.

When flex 2.5.25 generates a C scanner which is subsequently
compiled by a C++ compiler, the compiler may complain and
quit because (unlike good old C compilers) it can't deal
with assigning a void * return from yyalloc to some data
pointer without an explicit cast.  This happens for example
when building grap
(http://lunabase.org/~faber/Vault/software/grap/).

There may be other places where a similar cast is required to
appease C++ compilers; I haven't looked.

*** flex.skl.orig       Wed Dec 25 00:05:50 2002
--- flex.skl    Wed Dec 25 00:06:19 2002
***************
*** 909,915 ****
  
  #ifdef YY_USES_REJECT
          if ( ! YY_G(yy_state_buf) )
!             YY_G(yy_state_buf) = yyalloc(YY_BUF_SIZE + 2  YY_CALL_LAST_ARG);
  #endif
  
                if ( ! YY_G(yy_start) )
--- 909,915 ----
  
  #ifdef YY_USES_REJECT
          if ( ! YY_G(yy_state_buf) )
!             YY_G(yy_state_buf) = (yy_state_type *)yyalloc(YY_BUF_SIZE + 2  
YY_CALL_LAST_ARG);
  #endif
  
                if ( ! YY_G(yy_start) )