misc/bbedit: error and rune support

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5369057

misc/bbedit/Go.plist

@@ -23,6 +23,7 @@
 		default,      
 		defer,
 		else,
+		error,
 		fallthrough,
 		false,
 		float32,
@@ -54,6 +55,7 @@
 		real,
 		recover,
 		return,
+		rune,
 		select,
 		string,
 		struct,