Merge pull request #1398 from asomers/s390x-dup

Remove a duplicate stanza from .cirrus.yml

Author: asomers

.cirrus.yml

@@ -159,9 +159,6 @@ task:
     - name: Linux s390x
       env:
         TARGET: s390x-unknown-linux-gnu
-    - name: Linux s390x
-      env:
-        TARGET: s390x-unknown-linux-gnu
     - name: Linux x32
       env:
         TARGET: x86_64-unknown-linux-gnux32