Auto merge of #1255 - gnzlbg:android_fail, r=gnzlbg

Temporarily allow Android build jobs to fail

These are still too brittle for some reason.

.travis.yml

@@ -189,6 +189,9 @@ matrix:
       stage: tier2
 
   allow_failures:
+      # FIXME: android build bots time out irregularly
+      - env: TARGET=aarch64-linux-android
+      - env: TARGET=arm-linux-androideabi
       # FIXME: https://github.com/rust-lang/libc/issues/1226
       - env: TARGET=asmjs-unknown-emscripten
       - env: TARGET=wasm32-unknown-emscripten