strmbase: add IMediaPosition implementation to PosPassThru

[Aric Stewart]

---
  dlls/quartz/tests/dsoundrender.c  |    2 +-
  dlls/quartz/tests/videorenderer.c |    4 +-
  dlls/strmbase/pospass.c           |  334 
++++++++++++++++++++++++++++++++++---
  dlls/strmbase/renderer.c          |    2 +-
  dlls/winegstreamer/gsttffilter.c  |    2 +-
  dlls/wineqtdecoder/qtvdecoder.c   |    2 +-
  6 files changed, 320 insertions(+), 26 deletions(-)


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