Move g_VertexShaderSource macro towards VertexShaderSource.cpp (in preparation for the next commit, that's going to use it)

src/core/hle/D3D8/Direct3D9/Direct3D9.cpp

@@ -842,7 +842,6 @@ typedef struct {
 typedef std::unordered_map<resource_key_t, resource_info_t, resource_key_hash> resource_cache_t;
 resource_cache_t g_Cxbx_Cached_Direct3DResources;
 resource_cache_t g_Cxbx_Cached_PaletizedTextures;
-VertexShaderSource g_VertexShaderSource = VertexShaderSource();
 
 bool IsResourceAPixelContainer(XTL::DWORD XboxResource_Common)
 {

src/core/hle/D3D8/Direct3D9/VertexShaderSource.cpp

@@ -5,6 +5,8 @@
 #include "Logging.h"
 #include "util/hasher.h"
 #include "core/kernel/support/Emu.h"
+
+VertexShaderSource g_VertexShaderSource = VertexShaderSource();
 
 ID3DBlob* AsyncCreateVertexShader(IntermediateVertexShader intermediateShader, ShaderKey key) {
 	// HACK set thread affinity every call to reduce interference with Xbox main thread

src/core/hle/D3D8/Direct3D9/VertexShaderSource.h

@@ -41,5 +41,7 @@ private:
 
 	bool VertexShaderSource::_FindShader(ShaderKey key, LazyVertexShader** ppLazyShader);
 };
+
+extern VertexShaderSource g_VertexShaderSource;
 
 #endif