Without that fix ALSA is inconditionally disabled,
reguardless of the fact that alsa is in the distribution
feature or not.
This patch has been tested on the om-gta04 target with both
alsa distribution feature enabled(libsdl can then play sound),
and disabled(it fails to play some sound trough alsa).
Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@no-log.org> Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>