libbpf: Ignore warnings about "inefficient alignment"

Some consumers of libbpf compile the code base with different warnings
enabled. In a report for perf, for example, -Wpacked was set which
caused warnings about "inefficient alignment" to be emitted on a subset
of supported architectures.

With this change we silence specifically those warnings, as we intentionally
worked with packed structs.

This is a similar resolution as in b2f10cd4e805 ("perf cpumap: Fix alignment
for masks in event encoding").

Fixes: 1eebcb60633f ("libbpf: Implement basic zip archive parsing support")
Reported-by: Linux Kernel Functional Testing <[email protected]>
Signed-off-by: Daniel Müller <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Cc: Ian Rogers <[email protected]>
Link: https://lore.kernel.org/bpf/CA+G9fYtBnwxAWXi2+GyNByApxnf_DtP1-6+_zOKAdJKnJBexjg@mail.gmail.com/
Link: https://lore.kernel.org/bpf/[email protected]

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