Suppress symbol import warning from linker when building cctest.exe

Ignoring this linker warning will enable Chromium builds to start
treating all linker warnings as errors in Windows builds.

BUG=676417, 659007

Review-Url: https://codereview.chromium.org/2594013004
Cr-Commit-Position: refs/heads/master@{#41931}

test/cctest/BUILD.gn

@@ -358,6 +358,11 @@ v8_executable("cctest") {
   cflags = []
   ldflags = []
 
+  # crbug.com/676417: Suppress symbol import warning from linker.
+  if (is_win && is_component_build) {
+    ldflags = [ "/ignore:4217" ]
+  }
+
   if (v8_current_cpu == "ppc" || v8_current_cpu == "ppc64" ||
       v8_current_cpu == "arm" || v8_current_cpu == "arm64" ||
       v8_current_cpu == "s390" || v8_current_cpu == "s390x" ||