Do not run style checks on master

Author: gnzlbg

ci/azure-master.yml

@@ -15,8 +15,6 @@ jobs:
       vmImage: ubuntu-16.04
     steps:
       - template: azure-install-rust.yml
-      - script: sh ci/style.sh
-        displayName: Check style
       - script: LIBC_CI=1 sh ci/dox.sh
         displayName: Generate documentation
       - template: azure-configs/static-websites.yml@rustinfra