Reapply "gss: re-enable tests"

Two in-flight PRs (#327128 and #328673) both solved the same problem in
a different way. This merges the best of both PRs and re-enables tests.

This reverts commit e850cbb.

The original commit was accidentally merged to master instead of
staging.

pkgs/development/libraries/gss/default.nix

@@ -13,7 +13,9 @@ stdenv.mkDerivation rec {
  url = "mirror://gnu/gss/gss-${version}.tar.gz";
  hash = "sha256-7M6r3vTK4/znIYsuy4PrQifbpEtTthuMKy6IrgJBnHM=";
  };
- # This test crashes now. Most likely triggered by expiration on 20240711.
+
+ # krb5context test uses certificates that expired on 2024-07-11.
+ # Reported to bug-gss@gnu.org with Message-ID: <87cyngavtt.fsf@alyssa.is>.
  postPatch = ''
  rm tests/krb5context.c
  '';
@@ -29,10 +31,6 @@ stdenv.mkDerivation rec {
  "--${if withShishi then "enable" else "disable"}-kerberos5"
  ];
 
- # krb5context test uses certificates that expired on 2024-07-11.
- # Reported to bug-gss@gnu.org with Message-ID: <87cyngavtt.fsf@alyssa.is>.
- doCheck = !withShishi;
-
  # Fixup .la files
  postInstall = lib.optionalString withShishi ''
  sed -i 's,\(-lshishi\),-L${shishi}/lib \1,' $out/lib/libgss.la