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All the existing code that manipulates `ucontext_t` expects there to be a glibc-compatible sigmask (1024-bit). The `ucontext_t` struct need to be cleaned up so the glibc-dependent format is only used when linking glibc/musl library, but that is a more involved change. In practice, no Zig code looks at the sigset field contents, so it just needs to be the right size.