File digikam-pointer-casting.patch of Package digikam

Partially revert upstream commit d8f881d55a71 for Leap 15.6

diff --git a/core/libs/threadimageio/video/videothumbdecoder_p.cpp b/core/libs/threadimageio/video/videothumbdecoder_p.cpp
index 8007b22..7b419e2 100644
--- a/core/libs/threadimageio/video/videothumbdecoder_p.cpp
+++ b/core/libs/threadimageio/video/videothumbdecoder_p.cpp
@@ -294,7 +294,7 @@ bool VideoThumbDecoder::Private::processFilterGraph(AVFrame* const dst,
 
     av_image_copy(dst->data,
                   dst->linesize,
-                  reinterpret_cast<uint8_t**>(filterFrame->data),
+                  (const uint8_t**)filterFrame->data,
                   filterFrame->linesize,
                   pixfmt,
                   width,