alsa: bump 1.0.26 -> 1.0.27 (close #1198)

Basically, bump all alsa projects to their latest version as per
http://www.alsa-project.org/main/index.php/Main_Page
libxml2: bump 2.9.0 -> 2.9.1 (CVE-2013-1969)

And drop patch that has been merged upstream.
Close #1199.
Hack around python install problems (the rest is from bjornfor).