Squashed 'dbus/' changes from 370b2aa..ece67e7

0fbaad4 Prepare 1.6.22 in advance
8c71760 Handle ETOOMANYREFS when sending recursive fds (SCM_RIGHTS)
b9c338e If loader contains two messages with fds, don't corrupt the second

git-subtree-dir: dbus
git-subtree-split: ece67e7fe3f8bc909c9f63a971ce1ea035e68f2f
Merge commit 'c74faee4f62fd783ac6e2aa314ce57fd9cfa50e9'

[security] Upgrade to 1.6.22. Fixes CVE-2014-3532 and CVE-2014-3533.