Change speechd to openttsd in error messages and comments.
Change speechd to openttsd in error messages and comments.

Two of the error messages in src/server/output.c still referred to
speechd.  So did the comments associated with those error messages.
Thanks to Trevor Saunders for the original patch.

razr/opentts,razr/opentts,razr/opentts,razr/opentts