removed lock from dist_sink::_flush() (moved to base_sink::flush())
removed lock from dist_sink::_flush() (moved to base_sink::flush())

godbyk/spdlog,godbyk/spdlog,COMBINE-lab/spdlog,godbyk/spdlog,COMBINE-lab/spdlog,hunter-packages/spdlog,hunter-packages/spdlog,COMBINE-lab/spdlog,hunter-packages/spdlog