flite: change default back to oss, native alsa support package named as flite-alsa

* flite does not include working ALSA support, there is a patch made by Lukas Loehrer [1].
* Problem 1, this patch is a one-way street to alsa only. oss can't be build with this patch.
* Problem 2, flite becomes unmaintained, patch won't make upstream. Hence other applications
* using flite shared library doesn't necessarily support flite with native ALSA. e.g. speech-dispatcher.
* 
* revert flite packages: --with-audio=oss
* add flite-alsa packages: --with-audio=ass
*
* flite-1.3-Makefile.patch is a patch by Francois Aucamp that makes it possible
* to compile shared libraries of flite 1.3, this patch has already been included in flite-1.3 alsa patch.
*
* configure-with-audio.patch is a patch by Patrick Ohly which works for all versions except flite-alsa-1.2,
* in which au_none.h was not seen by libflite
*
* fix-read-only-assignments.patch was an acknowledged patch by both the original OE flite maintainer
* and Lukas Loehrer (i.e., flite-1.2 alsa patch contains this patch). However, Lukas Loehrer left this patch
* out of his flite-1.3 alsa patch. Leading me to believe this was fixed internally elsewhere in the 1.3 release.
* By the look of it, this seems has to be tested at runtime. 
*
* [1] http://homepage.hispeed.ch/loehrer/flite_alsa.html 

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