Enable s390x-unknown-linux-gnu on CI

Author: JohnTitor

ci/azure.yml

@@ -70,8 +70,8 @@ jobs:
           TARGET: powerpc64-unknown-linux-gnu
         powerpc64le-unknown-linux-gnu:
           TARGET: powerpc64le-unknown-linux-gnu
-        #s390x-unknown-linux-gnu:
-        #  TARGET: s390x-unknown-linux-gnu
+        s390x-unknown-linux-gnu:
+          TARGET: s390x-unknown-linux-gnu
         #wasm32-wasi
         #  TARGET: wasm32-wasi
         sparc64-unknown-linux-gnu: