font-latex-title-*-face color on light background terminals

font-latex-title-[123]-face are defined to have the foreground
yellow. On light background terminals (like white) it is hard to read
these faces. 
Different colors could be used for dark and light backgrounds. For
example blue for light backgrounds (no particular reason to choose
that, use whatever you like). Like so:

--- font-latex.el	Tue Mar  1 22:19:59 2005
+++ ../auctex/font-latex.el	Tue Mar  1 13:16:37 2005
@@ -163,7 +162,8 @@
 			      (number-to-string num) ".")
 		     :group 'font-latex-highlighting-faces)))
 	(eval `(defface ,face-name
-	   '((((type tty pc) (class color)) (:foreground "yellow" :weight bold))
+	   '((((type tty pc) (class color) (background dark)) (:foreground "yellow" :weight bold))
+	     (((type tty pc) (class color) (background light)) (:foreground "blue" :weight bold))
 	     (t (:height 1.2 :inherit ,(intern (concat
 						"font-latex-title-"
 						(number-to-string (1+ num))