t: avoid "subtest" for Perl 5.10.1 compatibility

The version of Test::More from Perl 5.10.1 did not support
"subtest", and the earliest version which did is Perl 5.12.0

The good news is this gives me an excuse to parallelize
the indexlevels-mirror test by splitting it into two.
(it could be further split, even).

Update t/nntpd. to use PI_TEST_VERSION consistently while
we're at it.

1 files changed, 1 insertions, 0 deletions

diff --git a/MANIFEST b/MANIFEST
index 8a3f2a4a..251f95f7 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -204,6 +204,7 @@ t/httpd.t
 t/hval.t
 t/import.t
 t/inbox.t
+t/indexlevels-mirror-v1.t
 t/indexlevels-mirror.t
 t/init.t
 t/linkify.t