Make sky/tools/packager build on Mac

sky/BUILD.gn

Index: sky/BUILD.gn
diff --git a/sky/BUILD.gn b/sky/BUILD.gn
index ecd27d8e1687076b9e0007f829547f75dc53fe15..f1fcc7a77a8f04d738a028e234446948d186996d 100644
--- a/sky/BUILD.gn
+++ b/sky/BUILD.gn
@@ -14,16 +14,12 @@ group("sky") {
     "//sky/engine/web:sky_unittests",
     "//sky/engine/wtf:unittests",
     "//sky/tools/imagediff",
+    "//sky/tools/packager($host_toolchain)",
     "//sky/tools/tester",
     "//sky/viewer",
     ":sky_apk",
   ]
 
-  # Mac's host toolchain doesn't support C++11 and can't build the packager.
-  if (host_os != "mac") {
-    deps += [ "//sky/tools/packager($host_toolchain)" ]
-  }
-
   if (is_android) {
     deps += [ "//sky/apk/stocks" ]
   }