Support speech when threads aren't available. (dm)


git-svn-id: svn://mielke.cc/main/brltty@8308 91a5dbb7-01b9-0310-9b5f-b28072856b6e
Log when the speech driver is being started and stopped. (dm)


git-svn-id: svn://mielke.cc/main/brltty@8309 91a5dbb7-01b9-0310-9b5f-b28072856b6e