[gn] add missing suppressions for linker warnings on windows

test/cctest/BUILD.gn

Index: test/cctest/BUILD.gn
diff --git a/test/cctest/BUILD.gn b/test/cctest/BUILD.gn
index daf59705922ea0e2ca3501ffee414e0f444f8f9f..db94e0c7ff0478e8656231bdb7f39c17f3f19233 100644
--- a/test/cctest/BUILD.gn
+++ b/test/cctest/BUILD.gn
@@ -160,4 +160,14 @@ v8_executable("generate-bytecode-expectations") {
   } else {
     deps += [ "../..:v8" ]
   }
+
+  if (is_win) {
+    # Suppress warnings about importing locally defined symbols.
+    if (is_component_build) {
+      ldflags = [
+        "/ignore:4049",
+        "/ignore:4217",
+      ]
+    }
+  }
 }