make sure we embed openssl and zlib in artifacts

tools/run_tests/build_artifacts.py

@@ -129,14 +129,15 @@ class CSharpExtArtifact:
                              '/p:PlatformToolset=v120',
                              '/p:Platform=%s' % msbuild_platform],
                             shell=True)
+    else:
+      environ = {'CONFIG': 'opt',
+                 'EMBED_OPENSSL': 'true',
+                 'EMBED_ZLIB': 'true'}
       if self.platform == 'linux':
-      environ = {'CONFIG': 'opt'}
         return create_docker_jobspec(self.name,
             'tools/jenkins/grpc_artifact_linux_%s' % self.arch,
             'tools/run_tests/build_artifact_csharp.sh')
       else:
-      environ = {'CONFIG': 'opt'}
-      if self.platform == 'macos':
         environ.update(macos_arch_env(self.arch))
         return create_jobspec(self.name,
                               ['tools/run_tests/build_artifact_csharp.sh'],