signal: use std::os::raw::c_int instead of libc::c_int on public API #3774
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taiki-e
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Motivation
libc::c_intandstd::os::raw::c_intare currently the same type, and are unlikely to change to other types, but technically libc can change this in the future minor version.See #3767 for more.
Solution
Use
std::os::raw::c_inton public API to prevent leaking a non-stable type alias from libc.Fixes #3767