fusion: Add a stub implementation of InitializeFusion.

dlls/fusion/fusion.spec

@@ -8,7 +8,7 @@
 @ stdcall CreateInstallReferenceEnum(ptr ptr long ptr)
 @ stdcall GetCachePath(long wstr ptr)
 @ stub GetHistoryFileDirectory
-@ stub InitializeFusion
+@ stdcall InitializeFusion()
 @ stub InstallCustomAssembly
 @ stub InstallCustomModule
 @ stub LookupHistoryAssembly

dlls/fusion/fusion_main.c

@@ -47,3 +47,9 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 
     return TRUE;
 }
+
+HRESULT WINAPI InitializeFusion(void)
+{
+    FIXME("\n");
+    return E_NOTIMPL;
+}