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gh-64783: Fix signal.NSIG value on FreeBSD (#91929)

Fix signal.NSIG value on FreeBSD to accept signal numbers greater
than 32, like signal.SIGRTMIN and signal.SIGRTMAX.

* Add Py_NSIG constant.
* Add pycore_signal.h internal header file.
* _Py_Sigset_Converter() now includes the range of valid signals in
  the error message.
V
Victor Stinner committed
20cc69528677b3e5191139d1cb587531f4893b55
Parent: 61381d7
Committed by GitHub <noreply@github.com> on 4/25/2022, 10:13:31 PM