ubuntu_bpf failed to build on Mantic since 6.5.0-33.33

[Po-Hsu Lin]

Issue found with Mantic 6.5.0-33.33

This issue does not exist in the last cycle with 6.5.0-28.29 (verified manually)

Test build failed with:
    TEST-OBJ [test_progs] verif_stats.test.o
    TEST-OBJ [test_progs] verifier.test.o
  make[1]: Leaving directory '/home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf'
  make: Leaving directory '/home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests'
  stderr:
  /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/prog_tests/verifier.c:32:10: fatal error: verifier_iterating_callbacks.skel.h: No such file or directory
     32 | #include "verifier_iterating_callbacks.skel.h"
        | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  compilation terminated.
  make[1]: *** [Makefile:578: /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/verifier.test.o] Error 1
  make: *** [Makefile:167: all] Error 2

[Po-Hsu Lin (cypressyew)]

Note that this is the commit that introduce this #include "verifier_iterating_callbacks.skel.h":
https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/mantic/commit/?h=master-next&id=a3bd8d1f3ebd9b872c650ec6a0ceb620fbcf449a

However it's a bit different from the upstream commit:
https://github.com/torvalds/linux/commit/958465e217dbf5fc6677d42d8827fb3073d86afd

We don't have the newly added tools/testing/selftests/bpf/progs/verifier_iterating_callbacks.c here in our tree.