limiter: split out from qspawn

It's slightly better organized this way, especially since
`publicinboxLimiter' has its own user-facing config section
and knobs.  I may use it in LeiMirror and CodeSearchIdx for
process management.

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/PublicInbox/MailDiff.pm b/lib/PublicInbox/MailDiff.pm
index 994c7851..c3ce9365 100644
--- a/lib/PublicInbox/MailDiff.pm
+++ b/lib/PublicInbox/MailDiff.pm
@@ -8,6 +8,7 @@ use PublicInbox::MsgIter qw(msg_part_text);
 use PublicInbox::ViewDiff qw(flush_diff);
 use PublicInbox::GitAsyncCat;
 use PublicInbox::ContentDigestDbg;
+use PublicInbox::Qspawn;
 
 sub write_part { # Eml->each_part callback
         my ($ary, $self) = @_;