fix unit test with old versions of boost

Gabriele Contini

2020-02-10 7cd73dd4f6ddec566c33596766c779beb873aa63

 src/library/os/linux/execution_environment.cpp

@@ -94,11 +94,12 @@
   return result;
}

bool ExecutionEnvironment::is_cloud() { return getCloudProvider() == NONE; }
bool ExecutionEnvironment::is_cloud() { return getCloudProvider() != ON_PREMISE; }

bool ExecutionEnvironment::is_docker() { return (checkContainerProc() == 1 || checkSystemdContainer() == 1); }

CLOUD_PROVIDER ExecutionEnvironment::getCloudProvider() {}

CLOUD_PROVIDER ExecutionEnvironment::getCloudProvider() {
   // TODO
}

}  // namespace license