dwmapi: Add a stub for DwmSetDxFrameDuration.

[Łukasz Wojniłowicz]

---
 dlls/dwmapi/dwmapi.spec   |    2 +-
 dlls/dwmapi/dwmapi_main.c |   11 +++++++++++
 2 files changed, 12 insertions(+), 1 deletions(-)

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