openldap: skip a problematic test on i686 already

See 63147b12a5

Apparently on i686-linux the test isn't flaky but failing reliably.
So restarting on Hydra won't help, and waiting for staging*
would take a few weeks.

pkgs/by-name/op/openldap/package.nix

@@ -128,6 +128,10 @@ stdenv.mkDerivation (finalAttrs: {
     # can probably be re-added once https://github.com/cyrusimap/cyrus-sasl/pull/772
     # has made it to a release
     rm -f tests/scripts/test076-authid-rewrite
+  ''
+  # FIXME: revert after this gets unconditional above (on staging* branch)
+  + lib.optionalString stdenv.hostPlatform.isi686 ''
+    rm -f tests/scripts/test*-sync*
   '';
 
   doCheck = true;