Remove dead code

Author: edolstra

src/nix/upgrade-nix.cc

@@ -15,14 +15,6 @@
 
 using namespace nix;
 
-/**
- * Check whether a path has a "profiles" component.
- */
-static bool hasProfilesComponent(const std::filesystem::path & path)
-{
-    return std::ranges::contains(path, OS_STR("profiles"));
-}
-
 /**
  * Settings related to upgrading Nix itself.
  */