[qemu] (6 commits) ...bump release to 16

[bonzini]

Summary of changes:

  a8e3fc5... fix previous commit (*)
  b7a1ff8... add missing linux-user targets (*)
  40e61a7... add more system targets that do not require any firmware (*)
  c32efea... add system targets that require pre-built firmware (*)
  31c6335... add s390x KVM support (*)
  ae1cd7d... bump release to 16 (*)

(*) This commit already existed in another branch; no separate mail sent