Software: Fix zfreeze with CullMode::All

Source/Core/VideoBackends/Software/SWVertexLoader.cpp

@@ -32,6 +32,13 @@ SWVertexLoader::SWVertexLoader() = default;
 
 SWVertexLoader::~SWVertexLoader() = default;
 
+DataReader SWVertexLoader::PrepareForAdditionalData(OpcodeDecoder::Primitive primitive, u32 count,
+                                                    u32 stride, bool cullall)
+{
+  // The software renderer needs cullall to be false for zfreeze to work
+  return VertexManagerBase::PrepareForAdditionalData(primitive, count, stride, false);
+}
+
 void SWVertexLoader::DrawCurrentBatch(u32 base_index, u32 num_indices, u32 base_vertex)
 {
   DebugUtil::OnObjectBegin();