Summary of changes in this release:
- dbus: add mask/unmask for unit files
- dbus: add PropPids to set initial pids of transient scope units
- util: conditionally build CGO functions
- activation: don't specify NextProtos so that we can take advantage of HTTP/2
- sdjournal: fix concurrent map access
- sdjournal: fix race condition in test
- sdjournal: fix memory leak in cursor handling