* Fixed Thread::start() to check resutls of pthread_*() on Unix platform.
* Fixed Thread::start() to check resutls of pthread_*() on Unix platform.

cybergarage/uhttp4cc,cybergarage/uhttp,cybergarage/uhttp4cc,cybergarage/uhttp4cc,cybergarage/uhttp,cybergarage/uhttp4cc,cybergarage/uhttp4cc,cybergarage/uhttp,cybergarage/uhttp,cybergarage/uhttp