`abs` has been deprecated, and shut down last month. [1]
`asp` replaces it, so rewrite the instructions to use this instead.
Also, add `--noextract` to the makepkg command, as there is no point
downloading and extracting the sources since they're not going to be
built here.
[1] https://www.archlinux.org/news/deprecation-of-abs/
Signed-off-by: Eric Engestrom <eric.engestrom@imgtec.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
