[gn] add missing suppressions for linker warnings on windows

BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/dcheck_always_on.gni")
 import("//build/config/mips.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
@@ skipping 2438 matching lines @@
     # v8_parser_shell can't be built against a shared library, so we
     # need to depend on the underlying static target in that case.
     deps += [ ":v8_maybe_snapshot" ]
   } else {
     deps += [ ":v8" ]
   }
 
   if (v8_enable_i18n_support) {
     deps += [ "//third_party/icu" ]
   }
+
+  if (is_win) {
+    # Suppress warnings about importing locally defined symbols.
+    if (is_component_build) {
+      ldflags = [
+        "/ignore:4049",
+        "/ignore:4217",
+      ]
+    }
+  }
 }
 
 if (want_v8_shell) {
   v8_executable("v8_shell") {
     sources = [
       "samples/shell.cc",
     ]
 
     configs = [
       # Note: don't use :internal_config here because this target will get
@@ skipping 96 matching lines @@
 
   deps = [
     ":fuzzer_support",
   ]
 
   configs = [ ":internal_config" ]
 }
 
 v8_fuzzer("wasm_asmjs_fuzzer") {
 }