Replace install-options with config-settings

See pypa/pip#11358.

Author: hmstepanek

tox.ini

@@ -397,7 +397,7 @@ commands =
     framework_grpc:     --grpc_python_out={toxinidir}/tests/framework_grpc/sample_application \
     framework_grpc:     /{toxinidir}/tests/framework_grpc/sample_application/sample_application.proto
 
-    libcurl: pip install --ignore-installed --install-option="--with-openssl" pycurl
+    libcurl: pip install --ignore-installed --config-settings="--build-option=--with-openssl" pycurl
 
     py.test -v []