Fix SSL.Connection.__del__
Without this change self.m2_ssl_free(self.ssl) is never called, because m2.bio_noclose is defined as "0". Hence, the if-condition is always false. This got broken in commit e2f707b1 ("SSL package: Port to python3").
Without this change self.m2_ssl_free(self.ssl) is never called, because m2.bio_noclose is defined as "0". Hence, the if-condition is always false. This got broken in commit e2f707b1 ("SSL package: Port to python3").