cmd/bpf2go: set -mcpu=v1 by default
cmd/bpf2go: set -mcpu=v1 by default

Clang by default probes the kernel it is running on to determine whether
it can enable advanced features like 32 bit operations, which is kind of
similar to -march=native behaviour. This is a bad idea for ahead of time
compiled code, since there is no guarantee that the kernel we compile on
is older than the kernel we want to run on.

cilium/ebpf,cilium/ebpf