feat: Fix dropreason for Linux 6.10+

[invidian]

Description

This PR updates vmlinux.h to include struct proto_accept_arg from Linux 6.10+ (torvalds/linux@92ef0fd) and then makes use of it in dropreason plugin to make plugin compatible with both kernels 6.10+ and older using bpf_core_type_exists.

Related Issue

#1906

Checklist

• I have read the contributing documentation.
• I signed and signed-off the commits (git commit -S -s ...). See this documentation on signing commits.
• I have correctly attributed the author(s) of the code.
• I have tested the changes locally.
• I have followed the project's style guidelines.
• I have updated the documentation, if necessary.
• I have added tests, if applicable.

Additional Notes

vmlinux.h still needs to be regenerated for arm64 which I'll try to soon. Done.

Also, I need to test those changes back on kernel 6.6 to make sure it's still working

Also, I am not aware if this change is covered by unit tests which would detect the regressions.

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[invidian]

Getting this part right requires some extensive testing. It would be good to have this covered by some form of automated tests to make sure code from those probes work as expected.

[nddq]

@invidian please empty out all of the object binaries. The reason we have those in there is for the linter to not complain since those are being embedded in the generated ebpf go files. Also, in terms of updating the vmlinux.h, we will open a PR from our side. Just to confirm, the vmlinux.h changes were from libbpf upstream correct? Or did you include any custom changes from elsewhere as well

[invidian]

Thanks for reviewing. I removed binary files from the PR. At the moment vmlinux.h files are taken from https://github.com/inspektor-gadget/inspektor-gadget/tree/main/include/gadget, just to make images to build. Appropriate sourcing is definitely worth it. It shouldn't have any custom changes though.