remove internal scripts

build.cm

@@ -8,7 +8,7 @@
 
 var fd = use('fd')
 var crypto = use('crypto')
-var utf8 = use('utf8')
+var blob = use('blob')
 var os = use('os')
 var toolchains = use('toolchains')
 var shop = use('internal/shop')
@@ -73,7 +73,7 @@ Build.detect_host_target = function() {
 // ============================================================================
 
 function content_hash(str) {
-  return text(crypto.blake2(utf8.encode(str)), 'h')
+  return text(crypto.blake2(new blob(str)), 'h')
 }
 
 function get_build_dir() {