CC Mode: fix minor errors in the fontification of enums.

1: Fix the typing of a space on the { line in an enum
specification which is the first item in a buffer.  This
defontified the enum's identifiers.
2: Fix the typing of a space on the line of the enum's last
identifier.  This defontified that identifier for
jit-lock-context-time.

* lisp/progmodes/cc-engine.el (c-forward-declarator): Cease
rejecting the identifier if there are no further tokens before
LIMIT.

* lisp/progmodes/cc-mode.el (c-fl-decl-start): Accept a
backward search as succeeding if it hits point-min.

lisp/progmodes/cc-engine.el

@@ -10045,7 +10045,7 @@ point unchanged and return nil."
 (defun c-forward-declarator (&optional limit accept-anon not-top)
   ;; Assuming point is at the start of a declarator, move forward over it,
   ;; leaving point at the next token after it (e.g. a ) or a ; or a ,), or at
-  ;; end of buffer if there is no such token.
+  ;; LIMIT (or end of buffer) if that comes first.
   ;;
   ;; Return a list (ID-START ID-END BRACKETS-AFTER-ID GOT-INIT DECORATED
   ;; ARGLIST), where ID-START and ID-END are the bounds of the declarator's
@@ -10178,9 +10178,6 @@ point unchanged and return nil."
 		 (c-safe (goto-char (scan-lists (point) 1 paren-depth)))
 	       (c-forward-syntactic-ws)))
 
-	 (or (eq (point) (point-max))	; No token after identifier.
-	     (< (point) limit))
-
 	 ;; Skip over any trailing bit, such as "__attribute__".
 	 (progn
 	   (while (cond

lisp/progmodes/cc-mode.el

@@ -2463,7 +2463,7 @@ with // and /*, not more generic line and block comments."
 			   (backward-char)
 			   (setq pseudo (c-cheap-inside-bracelist-p (c-parse-state)))))))
 	       (goto-char pseudo))
-	     (or pseudo (> (point) bod-lim)))
+	     (or pseudo (bobp) (> (point) bod-lim)))
 	   ;; Move forward to the start of the next declaration.
 	   (progn (c-forward-syntactic-ws)
 		  ;; Have we got stuck in a comment at EOB?