Due to some release process changes I didn't notice that one
important bugfix wasn't included in the v2.2.30 release branch
before I made the release. So fixing it here with v2.2.30.1.
Also included another less important fix.

  - quota_warning scripts weren't working in v2.2.30
  - vpopmail still wasn't compiling

Also I guess should mention that in v2.2.30+ the "script"
service's protocol changed to a new version. If anyone had
written their own script services (not using the included
"script" binary) they would need some changes. I haven't
heard of anyone having done that though.