Convert profiles to use std::filesystem::path

Co-authored-by: Vinayak Goyal <vinayakankugoyal@gmail.com>
Co-authored-by: Eelco Dolstra <edolstra@gmail.com>

src/libstore/build/derivation-building-goal.cc

@@ -307,7 +307,7 @@ Goal::Co DerivationBuildingGoal::tryToBuild()
            crashes.  If we can't acquire the lock, then continue; hopefully some
            other goal can start a build, and if not, the main loop will sleep a few
            seconds and then retry this goal. */
-        PathSet lockFiles;
+        std::set<std::filesystem::path> lockFiles;
         /* FIXME: Should lock something like the drv itself so we don't build same
            CA drv concurrently */
         if (auto * localStore = dynamic_cast<LocalStore *>(&worker.store)) {