[test] Skip test on noi18n.

Fails since test262-es6 is tested without i18n support.

BUG=v8:4437
LOG=n
NOTRY=true
TBR=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/1368293002

Cr-Commit-Position: refs/heads/master@{#30960}

test/test262/test262.status

@@ -740,6 +740,8 @@
 
 ['no_i18n == True and mode == debug', {
   # BUG(v8:4437).
+  'built-ins/String/prototype/normalize/return-normalized-string': [SKIP],
+  'built-ins/String/prototype/normalize/return-normalized-string-from-coerced-form': [SKIP],
   'built-ins/String/prototype/normalize/return-normalized-string-using-default-parameter': [SKIP],
 }],  # no_i18n == True and mode == debug