Support SIGRTMIN+n signals.
#1292
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Change `Signal` from an `enum` to a `struct` wrapper around an `i32` so that it can accomodate values it doesn't know about statically, and add APIs for constructing and working with `SIGRTMIN+n` signal values. This requires making `Signal::from_raw` depend on a new "use-libc-sigrt" feature, as it depends on being able to call into libc. This also adds `Signal::from_raw_unchecked` which does not call into libc and is unsafe. Fixes #1249.
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Change
Signalfrom anenumto astructwrapper around ani32so that it can accomodate values it doesn't know about statically, and add APIs for constructing and working withSIGRTMIN+nsignal values.This requires making
Signal::from_rawdepend on a new "use-libc-sigrt" feature, as it depends on being able to call into libc. This also addsSignal::from_raw_uncheckedwhich does not call into libc and is unsafe.Fixes #1249.