[release-14.0] Backport removal of posix-signals-on-macos
#7362
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Remove the leftover usage of
posix-signals-on-macos
(#7360)This follows up #6807 and removes the last remaining reference to the removed
posix-signals-on-macos
feature flag.Note that
lib.rs
now importsmod unix
on MacOS. This change is similar to the change intraphandlers.rs
in #6807. It is needed for hosts that use signals instead of Mach ports on MacOs.