Move travis workaround earlier

Try to get it used on OSX as well

library/stdarch/.travis.yml

@@ -37,13 +37,16 @@ matrix:
   allow_failures:
     - env: RUSTFMT=On TARGET=x86_64-unknown-linux-gnu NO_ADD=1
     - env: CLIPPY=On TARGET=x86_64-unknown-linux-gnu NO_ADD=1
+
+before_install:
+  # FIXME (travis-ci/travis-ci#8920) shouldn't be necessary...
+  - python -c "import fcntl; fcntl.fcntl(1, fcntl.F_SETFL, 0)"
+
 install:
   - if [ "$NO_ADD" == "" ]; then rustup target add $TARGET; fi
 
 script:
   - cargo generate-lockfile
-  # FIXME (travis-ci/travis-ci#8920) shouldn't be necessary...
-  - python -c "import fcntl; fcntl.fcntl(1, fcntl.F_SETFL, 0)"
   - ci/run-docker.sh $TARGET $FEATURES
 
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