adns: modernize `installCheckPhase`

pkgs/by-name/ad/adns/package.nix

···
     '';
 
   installCheckPhase = ''
-    set -eo pipefail
+    runHook preInstallCheck
 
     for prog in $out/bin/*; do
       $prog --help > /dev/null && echo $(basename $prog) shows usage
     done
+
+    runHook postInstallCheck
   '';
 
   passthru.updateScript = gitUpdater {