remove some more extra semicolons

Signed-off-by: Rosen Penev <rosenp@gmail.com>

src/thread/Util.cxx

@@ -94,7 +94,7 @@ SetThreadIdlePriority() noexcept
 #elif defined(_WIN32)
 	SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_IDLE);
 #endif
-};
+}
 
 void
 SetThreadRealtime()
@@ -111,4 +111,4 @@ SetThreadRealtime()
 	if (linux_sched_setscheduler(0, policy, &sched_param) < 0)
 		throw MakeErrno("sched_setscheduler failed");
 #endif	// __linux__
-};
+}