[googletest] Add dependencies needed for newer version of googletest

In rolling to a rev based on googletest aac1818, there's a new
dependency on fdio and libzx.

INTK-682 #comment [googletest] Add dependencies needed for newer version of googletest

Test: Manual build
Change-Id: I8bb0d91f0c2e5f19f32dd017742517152b894d8c
diff --git a/BUILD.gn b/BUILD.gn
index db255e7..f2ebff9 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -53,6 +53,13 @@
   sources -= [ "googletest/src/gtest-all.cc" ]
   public_configs = [ ":gtest_config" ]
   configs += [ ":gtest_private_config" ]
+
+  if (is_fuchsia) {
+    deps = [
+      "//zircon/public/lib/fdio",
+      "//zircon/public/lib/zx",
+    ]
+  }
 }
 
 static_library("gtest_main") {