misc/emacs: update list of builtins.

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/4630065

misc/emacs/go-mode.el

@@ -69,8 +69,8 @@
 some syntax analysis.")
 
 (defvar go-mode-font-lock-keywords
-  (let ((builtins '("cap" "close" "closed" "len" "make" "new"
-                    "panic" "panicln" "print" "println"))
+  (let ((builtins '("append" "cap" "close" "complex" "copy" "imag" "len"
+                    "make" "new" "panic" "print" "println" "real" "recover"))
         (constants '("nil" "true" "false" "iota"))
         (type-name "\\s *\\(?:[*(]\\s *\\)*\\(?:\\w+\\s *\\.\\s *\\)?\\(\\w+\\)")
         )