Never use the hermetic xcode toolchain for iOS recipes.

scripts/slave/recipes/webrtc/ios.expected/gyp_build.json

Index: scripts/slave/recipes/webrtc/ios.expected/gyp_build.json
diff --git a/scripts/slave/recipes/webrtc/ios.expected/gyp_build.json b/scripts/slave/recipes/webrtc/ios.expected/gyp_build.json
index 2a470ab31b3b17870b30e2548600a1b4427bff26..1fa04f64ac955f9d7440b70c744ec25e8f8e712b 100644
--- a/scripts/slave/recipes/webrtc/ios.expected/gyp_build.json
+++ b/scripts/slave/recipes/webrtc/ios.expected/gyp_build.json
@@ -136,6 +136,7 @@
     "cwd": "[BUILDER_CACHE]/ios_gyp/src",
     "env": {
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json",
+      "GYP_DEFINES": "component=static_library target_arch=x64",
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient runhooks"
@@ -213,7 +214,7 @@
       "--goma-dir",
       "[CACHE]/cipd/goma",
       "--gyp-script=[BUILDER_CACHE]/ios_gyp/src/webrtc/build/gyp_webrtc.py",
-      "//out/None"
+      "//out/Release"
     ],
     "cwd": "[BUILDER_CACHE]/ios_gyp/src",
     "env": {