[th/fix-libnm-includes] libnm: fix C11-ism in public headers w.r.t. forward declaration of typedefs
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Fixes: 649314dd ('libnm: replace nm-types.h by defining the types in respective headers').
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Related: !1211 (merged)
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See for example here: https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/jobs/22371508#L5927