circleci-matrix: Cleanup, remove now unneeded workaround

Author: jcfr

.circleci-matrix.yml

@@ -9,8 +9,5 @@ env:
   - MANYLINUX_IMAGE=manylinux-x86 MANYLINUX_PYTHON=cp35-cp35m
 command:
   - docker run dockcross/$MANYLINUX_IMAGE > dockcross && chmod +x ./dockcross
-  - sed -ie "s/cat \/dev/head -c 500 \/dev/" dockcross
   - MANYLINUX_RUN_ENV=./dockcross MANYLINUX_PYTHON=$MANYLINUX_PYTHON ci --clear-cached-env
   - mv dist/* $CIRCLE_ARTIFACTS/
-  - echo "CIRCLE_ARTIFACTS:$CIRCLE_ARTIFACTS"
-  - ls $CIRCLE_ARTIFACTS/