Do for icui18n what rr291699 did for icuuc.

icu.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'includes': [
     'icu.gypi',
   ],
   'variables': {
     'use_system_icu%': 0,
@@ skipping 214 matching lines @@
               'toolsets': ['target'],
             }],
             ['OS == "android" and clang==0', {
                 # Disable sincos() optimization to avoid a linker error since
                 # Android's math library doesn't have sincos().  Either
                 # -fno-builtin-sin or -fno-builtin-cos works.
                 'cflags': [
                     '-fno-builtin-sin',
                 ],
             }],
+            [ 'OS == "win" and clang==1', {
+              # Note: General clang warnings should go in the
+              # clang_warning_flags block above.
+              'msvs_settings': {
+                'VCCLCompilerTool': {
+                  'AdditionalOptions': [
+                    # See http://bugs.icu-project.org/trac/ticket/11122
+                    '-Wno-inline-new-delete',
+                    '-Wno-implicit-exception-spec-mismatch',
+                  ],
+                },
+              },
+            }],
             ['OS == "android" and use_system_stlport == 1', {
               'target_conditions': [
                 ['_toolset == "target"', {
                   # ICU requires RTTI, which is not present in the system's
                   # stlport, so we have to include gabi++.
                   'include_dirs': [
                     '<(android_src)/abi/cpp/include',
                   ],
                   'link_settings': {
                     'libraries': [
@@ skipping 363 matching lines @@
           },
           'includes': [
             '../../build/shim_headers.gypi',
           ],
           'toolsets': ['target'],
         },
       ], # targets
     }],
   ], # conditions
 }