Allow forcibly closing existing audio device to allow opening a new one.
Fixes audio failure when answering calls on Linux.


git-svn-id: http://yate.null.ro/svn/yate/trunk@5879 acf43c95-373e-0410-b603-e72c3f656dc1
Accept SDP crypto with tag 0.
Fixes bug #367.


git-svn-id: http://yate.null.ro/svn/yate/trunk@5880 acf43c95-373e-0410-b603-e72c3f656dc1
Bumped version to 5.4.0 release.


git-svn-id: http://yate.null.ro/svn/yate/trunk@5881 acf43c95-373e-0410-b603-e72c3f656dc1
Merge branch 'upstream' of github.com:vir/yate into deb
Updated debian package version to 5.4.0~svn5881