libxml2: remove libxml2:host
busybox: drop support for network filesystems
linux: remove network filesystems

xbmc has nfs/smb via libnfs/libsmbclient. use it!
mkpkg/xbmc: cleanup
xbmc: update to xbmc-14-a29b21a
xbmc-pvr-addons: uodate to xbmc-pvr-addons-1975fa9