thread_pthread.c: shorten and fix thread cache implementation

Update to use ccan/list for constant-time delete on expiry and
avoid malloc.  We must also initialize th->thread_id upon thread
reuse so Thread#name= works immediately upon thread creation.

We must also reinitialize the cache mutex and list_head on
fork like we do with GVL and timer thread mutexes.
While we're at it, use monotonic clock for timeout to avoid
system time changes.

"make exam TESTS='-x test_time_tz'" passes with USE_THREAD_CACHE
enabled (but remains off, here).

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62466 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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