[qt5-qtmultimedia/f21] (5 commits) ...5.4.0 (final) + backported gst1 support from dev/ branch

[Rex Dieter]

Summary of changes:

  8acbe78... 5.4.0-beta (*)
  1d38c80... out-of-tree build, use %qmake_qt5 (*)
  e97ad4a... wip/gstreamer1 snapshot (#1149885) (*)
  5c791ac... new sources (*)
  ca31228... 5.4.0 (final) + backported gst1 support from dev/ branch (*)

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