better support for thread id in FreeBSD
better support for thread id in FreeBSD

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