unless it's necessary.
* cpplib.h (parse_marker): Removed.
- (struct cpp_buffer): Line_base is now a unsigned char *; add
+ (struct cpp_buffer): Line_base is now an unsigned char *; add
`mark' [long], remove `marks' [struct parse_marker *].
(parse_set_mark, parse_clear_mark, parse_goto_mark): Update
prototypes.