[PATCH] tests: Run the trust-pgp-4 test again.

[NIIBE Yutaka]

Damien Goutte-Gattat <dgouttegattat at incenp.org> wrote:
> Now that issue 2923 is fixed, the trust-pgp-4 test passes as
> expected and we can enable it again. That should help prevent
> a future regression on this issue.

Thanks, applied.

I think that the feature is not supported well.  When DISABLE_REGEX is
enabled (Windows), the feature is not available.  So, I added another
patch to disable this test when DISABLE_REGEX.
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