eSpeak: speech synthesis

See also http://defect.opensolaris.org/bz/show_bug.cgi?id=10858.

The wave_sada.cpp file for eSpeak determines if audio is playing by using
the play.active field of audio_info_t. With the introduction of the boomer
audio system to OpenSolaris, the behavior of the play.active field is
inconsistent with the prior behavior - for all intents and purposes, it is
now never cleared as used by wave_sada.cpp. The result is that calls to
eSpeak_Synchronize hang even if no speech samples are being played because
wave_is_busy always returns True.

A boomer integrator says the play.active field is being used incorrectly by
eSpeak's wave_sada.cpp file and that a different solution needs to be
provided by eSpeak, not boomer.

The attached patch to espeak-1.40.02 changes wave_sada.cpp:wave_is_busy to
look at the time remaining to play instead of the play.active field. This
works well on pre-boomer and post-boomer versions of OpenSolaris and
resolves the problem.