The reason I went to autotools was the multiple sound systems, but since
we are now just using espeak's audio processing we can go back to a more
simple build system.
The direct alsa support was experimental and never worked well. It had a
setting which was system specific. Also, I feel that it is better to let
espeak control the audio processing.
This commit updates the makefile and the documentation to explain how to
build alsa support. It has not been fully tested, so it is not built by
default. Also, I was able to remove the conditional compile directives
from the source.
