[NaCl SDK] Temporarily disable building AppEngine demos.

native_client_sdk/src/build_tools/build_sdk.py

Index: native_client_sdk/src/build_tools/build_sdk.py
diff --git a/native_client_sdk/src/build_tools/build_sdk.py b/native_client_sdk/src/build_tools/build_sdk.py
index e41f985b0253378541522257c4ba4267021a7a40..1dda093c26cdf8161cbf75f72857cfbe11e498fb 100755
--- a/native_client_sdk/src/build_tools/build_sdk.py
+++ b/native_client_sdk/src/build_tools/build_sdk.py
@@ -943,7 +943,10 @@ def main(args):
   if buildbot_common.IsSDKBuilder():
     options.archive = True
     options.build_ports = True
-    options.build_app_engine = True
+    # TODO(binji): re-enable app_engine build when the linux builder stops
+    # breaking when trying to git clone from github.
+    # See http://crbug.com/412969.
+    options.build_app_engine = False
     options.tar = True
 
   toolchains = ['newlib', 'glibc', 'arm', 'pnacl', 'host']