Fix more gcc compilation issues

src/ObjCommon/Image/ImageFormat.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <cstdint>
+#include <cstddef>
 #include "DxgiFormat.h"
 
 enum class ImageFormatId

src/ObjCommon/Image/Texture.cpp

@@ -1,6 +1,8 @@
 #include "Texture.h"
+
 #include <algorithm>
 #include <cassert>
+#include <cstring>
 
 // ==============================================
 // ================= Texture ====================

src/ObjCommon/Image/TextureConverter.cpp

@@ -56,7 +56,7 @@ void TextureConverter::SetPixelFunctions(const unsigned inBitCount, const unsign
             assert(false);
             m_read_pixel_func = [](const void* offset, unsigned bitCount)
             {
-                return 0ui64;
+                return 0ull;
             };
         }
         break;