libbpf: Add support to use optional extended section index table

[kernel-patches-bot]

Pull request for series with
subject: libbpf: Add support to use optional extended section index table
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=420809

[kernel-patches-bot]

Master branch: b9557ca
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=420809
version: 1

Pull request is NOT updated. Failed to apply https://patchwork.kernel.org/project/netdevbpf/list/?series=420809
error message:

Cmd('git') failed due to: exit code(128)
  cmdline: git am -3
  stdout: 'Applying: elf_symtab: Add support for SHN_XINDEX index to elf_section_by_name
Patch failed at 0001 elf_symtab: Add support for SHN_XINDEX index to elf_section_by_name
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".'
  stderr: 'error: sha1 information is lacking or useless (dutil.c).
error: could not build fake ancestor
hint: Use 'git am --show-current-patch' to see the failed patch'

conflict:

[kernel-patches-bot]

At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=420809 irrelevant now. Closing PR.