update package unicode to Unicode 5.2

R=rsc
CC=golang-dev
https://golang.org/cl/163062
diff --git a/src/pkg/unicode/maketables.go b/src/pkg/unicode/maketables.go
index e376172..c96c12e 100644
--- a/src/pkg/unicode/maketables.go
+++ b/src/pkg/unicode/maketables.go
@@ -32,7 +32,7 @@
 
 var dataURL = flag.String("data", "", "full URL for UnicodeData.txt; defaults to --url/UnicodeData.txt")
 var url = flag.String("url",
-	"http://www.unicode.org/Public/5.1.0/ucd/",
+	"http://www.unicode.org/Public/5.2.0/ucd/",
 	"URL of Unicode database directory")
 var tablelist = flag.String("tables",
 	"all",