wwwatomstream: support async blob fetch

This allows -httpd to handle other requests while waiting
for git to retrieve and decode blobs.  We'll also break
apart t/psgi_v2.t further to ensure tests run against
-httpd in addition to generic PSGI testing.

Using xt/httpd-async-stream.t to test against clones of meta@public-inbox.org
shows a 10-12% performance improvement with the following env:
TEST_JOBS=1000 TEST_CURL_OPT=--compressed TEST_ENDPOINT=new.atom

1 files changed, 4 insertions, 3 deletions

diff --git a/Documentation/mknews.perl b/Documentation/mknews.perl
index ba049d9e..2d22d147 100755
--- a/Documentation/mknews.perl
+++ b/Documentation/mknews.perl
@@ -147,9 +147,10 @@ EOF
 }
 
 sub mime2atom  {
-        my ($out, $astream, $mime, $ctx) = @_;
-        my $smsg = bless { mime => $mime }, 'PublicInbox::Smsg';
-        if (defined(my $str = $astream->feed_entry($smsg))) {
+        my ($out, $astream, $eml, $ctx) = @_;
+        my $smsg = bless {}, 'PublicInbox::Smsg';
+        $smsg->populate($eml);
+        if (defined(my $str = $astream->feed_entry($smsg, $eml))) {
                 print $out $str or die;
         }
 }