Merge branch 'libbpf-global-vars'

Andrii Nakryiko says:

====================
This patch set salvages all the non-extern-specific changes out of blocked
externs patch set ([0]). In addition to small clean ups, it also refactors
libbpf's handling of relocations and allows support for global (non-static)
variables.

  [0] https://patchwork.ozlabs.org/project/netdev/list/?series=143358&state=*
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>