Make sure that the sym_xyz function pointers have the types that the functions we'll assign them have. And of course, this found a number of incompatibilities right-away, in particular in the bpf hookup. (Doing this will trigger deprecation warnings from libbpf. I simply turned them off locally now, since we are well aware of what we are doing in that regard.) There's one return type fix (bool → int), that actually matters I think, as it might have created an incompatibility on some archs.
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