Fix fontification of first declaration within a C++ lambda form.

* lisp/progmodes/cc-engine.el (c-looking-at-or-maybe-in-bracelist): Cease
spuriously recognizing the braces of a lambda form as a brace list when there
is an "=" preceding the introductory brackets.

lisp/progmodes/cc-engine.el

@@ -10440,7 +10440,7 @@ comment at the start of cc-engine.el for more info."
 		c-decl-block-key))
 	  (braceassignp 'dontknow)
 	  inexpr-brace-list bufpos macro-start res pos after-type-id-pos
-	  in-paren)
+	  in-paren parens-before-brace)
 
       (setq res (c-backward-token-2 1 t lim))
       ;; Checks to do only on the first sexp before the brace.
@@ -10458,6 +10458,9 @@ comment at the start of cc-engine.el for more info."
 		((and (looking-at c-symbol-start)
 		      (not (looking-at c-keywords-regexp)))
 		 (setq after-type-id-pos (point)))
+		((eq (char-after) ?\()
+		 (setq parens-before-brace t)
+		 nil)
 		(t nil))
 	       (save-excursion
 		 (cond
@@ -10506,6 +10509,14 @@ comment at the start of cc-engine.el for more info."
 	;; Single identifier between '(' and '{'.  We have a bracelist.
 	(cons after-type-id-pos 'in-paren))
 
+       ;; Are we at the parens of a C++ lambda expression?
+       ((and parens-before-brace
+	     (save-excursion
+	       (and
+		(zerop (c-backward-token-2 1 t lim))
+		(c-looking-at-c++-lambda-capture-list))))
+	nil)			     ; a lambda expression isn't a brace list.
+
        (t
 	(goto-char pos)
 	;; Checks to do on all sexps before the brace, up to the