[PATCH 2/3] windowscodecs: Add stub implementation for IWICDdsDecoder.

[Ziqing Hui]

see: https://docs.microsoft.com/en-us/windows/win32/api/wincodec/nn-wincodec-iwic...

Signed-off-by: Ziqing Hui <zhui(a)codeweavers.com>
---
 dlls/windowscodecs/ddsformat.c | 60 +++++++++++++++++++++++++++++++---
 include/wincodec.idl           | 45 +++++++++++++++++++++++++
 2 files changed, 100 insertions(+), 5 deletions(-)