add platform prefix to kprobe symbol if missing

[monrax]

Cilium has a nice feature in their link package where:

If attaching to symbol fails, automatically retries with the running platform's syscall prefix (e.g. _x64) to support attaching to syscalls in a portable fashion.

It catches any file not found errors and then it uses internal.PlatformPrefix (from the internal package) to prepend the right prefix to the function symbol to then try again: https://github.com/cilium/ebpf/blob/v0.16.0/link/kprobe.go#L171C1-L176C3

I'm opening this issue here since I was using bpfman on k8s and my Kprobeprogram couldn't be loaded successfully (I couldn't figure out the error messages, until I realized the error was the symbol I was trying to attach the kprobe to was missing the __x64_ prefix -- which I wasn't really paying to much attention to since I was using link.Kprobe). However, I'm not sure if this should go in the bfpman repo instead.

I don't know much Rust myself, but I might be able to put something together for this small convenience function (although, if there's a place where we can do this in Go I can probably help better!)

[Billy99]

There was an AYA feature that did this:
https://github.com/aya-rs/aya/blob/73a34e1571a606124c7e89ecf71ff001508643dc/aya/src/util.rs#L326
It was backed out because there was some arch specifics that needed for kprobes. Needs more discussion.