Bug 1100657: Raise timeout value for emulator build task. r=lightsofapollo

--HG--
extra : rebase_source : f8a9a836000e1b8ac857e41be45c7caac3f58ebc
extra : source : 258e0bc92d78f5ec73ce469d86c395e1e02983b9

testing/taskcluster/tasks/builds/b2g_emulator.yml

@@ -27,7 +27,7 @@ task:
       REPOSITORY: '{{repository}}'
 
     image: '{{#docker_image}}builder{{/docker_image}}'
-    maxRunTime: 7200
+    maxRunTime: 14400
 
     command:
       - build-emulator.sh