community/linux-tools: add bpftool
add bpftool, this only makes sense in the context of #12563 (closed)
bpftool isn't compatible with musl, so a few patches have been added.
The patches have been sent upstream here:
https://lkml.kernel.org/r/20220424051022.2619648-1-asmadeus@codewreck.org
(EDIT: patches have been merged in v5.19-rc1)
As described in the comments, some of this isn't perfect -- in particular
we don't really care about runqslower since it won't be installed, so we
don't need libargp-standalone nor its workaround..
This will be updated depending on upstream feedback.
(EDIT: this part was taken out as useless)