ART: Add SetSpecialSignalHandlerFn to version-script.txt

Expose the new function from the sigchainlib implementation.

Bug: 20217701

(cherry picked from commit e089920eb0abc10eca708dbf5993134aa7e8d9b0)

Change-Id: I7d21025595775e057ea703236ca88ceb07173136
1 file changed