Enable std_detect_env_override feature on CI tests
diff --git a/ci/azure.yml b/ci/azure.yml
index f1269b0..34f22a4 100644
--- a/ci/azure.yml
+++ b/ci/azure.yml
@@ -194,7 +194,7 @@
       vmImage: ubuntu-16.04
     steps:
       - template: azure-install-rust.yml
-      - script: RUST_STD_DETECT_UNSTABLE=avx cargo test --manifest-path crates/std_detect/Cargo.toml env_override_no_avx
+      - script: RUST_STD_DETECT_UNSTABLE=avx cargo test --features=std_detect_env_override --manifest-path crates/std_detect/Cargo.toml env_override_no_avx
         displayName: std_detect env override
 
 #  - job: GameBoyAdvance