dvdnav: Don't unconditionally print the current version

Let users invoke dvdnav_version if they wish to know
4 jobs for improve_logging in 2 minutes and 30 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #361690
amd64 debian
build-debian

00:00:41

passed #361691
macos
build-macos

00:00:57

passed #361693
win32 amd64 debian
build-win32

00:01:47

passed #361692
win64 amd64 debian
build-win64

00:01:55