d3d9: Add DF16 support

[Frank Richter]

As far as I could gather DF16 is the "ATI way" of getting a renderable
16 bit depth texture.
---
 dlls/wined3d/directx.c   |    1 +
 dlls/wined3d/utils.c     |    7 +++++++
 include/wine/wined3d.idl |    1 +
 3 files changed, 9 insertions(+), 0 deletions(-)


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