Bug 1615001 - `always-target` android-lints like other mozlints. r=tomprince

Differential Revision: https://phabricator.services.mozilla.com/D64784

--HG--
extra : moz-landing-system : lando

taskcluster/ci/source-test/mozlint-android.yml

@@ -8,6 +8,7 @@
 # clone and somewhat expensive compilation of the Android
 # intermediates just once.
 lints:
+    always-target: true
     attributes:
         build_platform: android
         build_type: opt