block Test2 in tests where Test::More isn't allowed

Tests in t/ are generally not allowed to use Test::More or related
modules. Instead, they are meant to use t/test.pl. There is a porting
test to make sure they are not used.

Test2 should be blocked in the same places that Test::More is.

Author: haarg

t/porting/test_bootstrap.t

@@ -39,7 +39,7 @@ while (my $file = <$fh>) {
     # but exclude this file from that test.
     unlike(
         $contents,
-        qr/use\s+Test::(?:Simple|More)/,
+        qr/use\s+(?:Test::(?:Simple|More|Builder)|Test2)/,
         "$file doesn't use Test::Simple or Test::More"
     ) unless ($file =~ m|porting/test_bootstrap\.t|);
     next unless $file =~ m!^base/! or $file =~ m!^comp!;