enable azure ops in linux whl packaging

Author: RandyShuai

.pipelines/wheels_linux.yml

@@ -2,7 +2,7 @@ parameters:
 - name: ExtraEnv
   displayName: 'Extra env variable set to CIBW_ENVIRONMENT, in form of "A=1 B=2 C=3"'
   type: string
-  default: 'ExampleEnvVar=ON'
+  default: 'OCOS_ENABLE_AZURE=1'
 
 jobs:
 - job: linux