VideoCommon/VertexLoader_Normal: Initialize function table at compile-time

Makes VertexLoader_Normal completely stateless, eliminating the need for
an Init() function, and by extension, also gets rid of the need for the
FifoAnalyzer to have an Init() function.

Source/Core/VideoCommon/VertexLoader.cpp

@@ -68,8 +68,6 @@ static void SkipVertex(VertexLoader* loader)
 VertexLoader::VertexLoader(const TVtxDesc& vtx_desc, const VAT& vtx_attr)
     : VertexLoaderBase(vtx_desc, vtx_attr)
 {
-  VertexLoader_Normal::Init();
-
   CompileVertexTranslator();
 
   // generate frac factors