FSBUILD-95 user freeswitch not added to audio group

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@10758 d0543943-73ff-0310-b7d9-9358b9ac24b2

debian/postinst

@@ -25,6 +25,7 @@ case "$1" in
 			adduser --disabled-password  --quiet --system \
 			--home /opt/freeswitch \
 			--gecos "FreeSwitch Voice Platform" --ingroup daemon \
+			--add_extra_groups audio \
 			freeswitch
 		fi