Disable warnings in VS that won't be fixed anyway.

This is to enable warnings as error.

TBR=jungshik@chromium.org
Review URL: http://codereview.chromium.org/6893058

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/icu46@83674 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
diff --git a/icu.gyp b/icu.gyp
index 0d87376..fba9131 100644
--- a/icu.gyp
+++ b/icu.gyp
@@ -37,7 +37,7 @@
           'source/common',
           'source/i18n',
         ],
-        'msvs_disabled_warnings': [4005],
+        'msvs_disabled_warnings': [4005, 4355, 4996],
       },
       'targets': [
         {