Flex 2.5.11 comments

[Bruce Lilly]

Some comments on 2.5.11 issues:

1. typo in a comment in generated .c file; search
   for "rtad" and transpose the first two characters.

2. Another reason to use reentrant scanners: shared
   object files (should be mentioned in sect. 18.1).

3. yyalloc, yyrealloc, and yyfree are declared and
   called with an additional argument in reentrant
   scanners, but in no case is the additional argument
   used.  It would be nice if these three were declared
   and called without the additional argument so as to
   be compatible with standard malloc, realloc, and free
   function calls (in case the user wants to redefine
   them).

Best regards,
  Bruce Lilly