gh-106320: Remove private _PyOS_IsMainThread() function (#108605)

Move the following private API to the internal C API
(pycore_signal.h): _PyOS_IsMainThread() and _PyOS_SigintEvent().

Victor Stinner committed 2y ago

fadc2dc7df99501a40171f39b7cd23be732860cc

Parent: c9eefc7

Committed by GitHub <noreply@github.com> on 8/29/2023, 3:20:31 AM