Log Message:
Update alsa packages to 1.0.21.
http://www.alsa-project.org/main/index.php/Changes_v1.0.18_v1.0.19
http://www.alsa-project.org/main/index.php/Changes_v1.0.19_v1.0.20
http://www.alsa-project.org/main/index.php/Changes_v1.0.20_v1.0.21
contain ~300kB of changes.