autotools: Add a --with-sada argument (default: no) to enable Solaris SADA audio support.

configure.ac

 dnl Audio checks.
 dnl ================================================================
 
+AC_ARG_WITH([sada],
+    [AS_HELP_STRING([--with-sada], [use the Solaris SADA audio API @<:@default=no@:>@])],
+    [])
+
+if test "$with_sada" = "yes" ; then
+	have_sada=yes
+else
+	have_sada=no
+fi
+
 if test "$have_portaudio" = 18 -o "$have_portaudio" = 19 ; then
     if test "$have_pulseaudio" = yes ; then
         PKG_CHECK_MODULES(PULSEAUDIO_SIMPLE, [libpulse-simple >= 0.9],
     fi
 elif test "$have_pulseaudio" = yes ; then
     AUDIO=pulseaudio
+elif test "$have_sada" = yes ; then
+    AUDIO=sada
 else
     AUDIO=disabled
 fi
         wxWidgets:                     ${WX_VERSION}
 	pulseaudio:                    ${have_pulseaudio}
 	portaudio:                     ${have_portaudio}
+	sada:                          ${have_sada}
 	audio configuration:           ${AUDIO}
 ])