Fix clang 13 compilation problems (#5791)

* Fix clang 13 compilation problems

Re-instated ShowPlayedSequencesDebug logic by introducing no-op lambda
which replaces missing `Draw2dLabel` functionality ( added TODO marker
there )

Signed-off-by: nemerle <96597+nemerle@users.noreply.github.com>

* apply review suggestions

Signed-off-by: nemerle <96597+nemerle@users.noreply.github.com>

* Fix type in assert message

Signed-off-by: nemerle <96597+nemerle@users.noreply.github.com>

Gems/Atom/Asset/ImageProcessingAtom/External/CubeMapGen/CCubeMapProcessor.cpp

@@ -1438,15 +1438,12 @@ namespace ImageProcessingAtom
         int32 a_Channel2Src, int32 a_Channel3Src )
     {
         int32 iFace, iMipLevel, u, v, k;
-        int32 size;
         CP_ITYPE texelData[4];
         int32 channelSrcArray[4];
 
         //since output is being modified, terminate any active filtering threads
         TerminateActiveThreads();
 
-        size = m_OutputSize;
-    
         channelSrcArray[0] = a_Channel0Src;
         channelSrcArray[1] = a_Channel1Src;
         channelSrcArray[2] = a_Channel2Src;