(font-lock-unfontify-region): Don't remove `font-lock' props.
(font-lock-hack-keywords): Don't add `font-lock' props.
Handle values other than t and nil for allow-overlap-p specially.
(c-font-lock-keywords-1): Don't override how comments in #if... appear.
Highlight text after #else or #endif.
Scan for comments and strings from beg of line.
(c-font-lock-keywords-1): Recognize &, like *, before fn name.
(perl-font-lock-keywords): Put digit 1 into function-name-face items.
Allow whitespace before the open-brace.
first element of the list.
(font-lock-hack-keywords, font-lock-unfontify-region)
(font-lock-fontify-region): Bind buffer-read-only to nil,
and don't alter buffer-modified-p.
(font-lock-fontify-region): Use comment-start-skip, not comment-start.
(font-lock-function-name-face): defvar renamed.
(font-lock-hack-keywords): Evaluate face specs from keyword list.
