Avoid using Proc.status

This method has been deprecated. Instead we now use Proc.exitcode and
Proc.signal to recreate the value.

lib/TAP.pm

@@ -101,7 +101,7 @@ class Result {
         $!exit-status.defined ?? $!exit-status.exitcode !! Int;
     }
     method wait() {
-        $!exit-status.defined ?? $!exit-status.status !! Int;
+        $!exit-status.defined ?? ($!exit-status.exitcode +< 8) +| $!exit-status.signal !! Int;
     }
 
     method has-problems($ignore-exit) {