[PATCH v2] fakeroot: fix to work with glibc 2.33

[Ilya Lipnitskiy]

> If they ask you to resubmit with changes, add that too please.
Somehow I doubt that the upstream will be quick to respond, but one may hope :)

I went ahead and fixed a couple more compiler warnings and an error
when building with DEBUG enabled. I have also applied your suggested
style changes. I'll roll the patch series shortly.

- Ilya