hooklib: Split out of util

This is distinct from capnhook's hooklib, although the intent is
the same. Hopefully these two libraries sharing a name won't get
too confusing...

hooklib/setupapi.h

@@ -0,0 +1,7 @@
+#pragma once
+
+#include <windows.h>
+
+#include <stddef.h>
+
+HRESULT setupapi_add_phantom_dev(const GUID *iface_class, const wchar_t *path);