469a404c3b
configure: add checks for `__thread` on top of current check for `_Thread_local` and define OPAL_HAVE_THREAD_LOCAL if the compiler support TLS. Added `opal_thread_local` keyword to unify the definition. Signed-off-by: Thananon Patinyasakdikul <thananon.patinyasakdikul@intel.com>