* nix/scripts/list-runtime-roots.in: New file.
* config-daemon.ac: Add `AC_CONFIG_FILES' invocation for it.
* daemon.am (nodist_pkglibexec_SCRIPTS): New variable.
(AM_TESTS_ENVIRONMENT): Define `top_builddir'.
* tests/guix-daemon.sh: Export `NIX_ROOT_FINDER'.
* nix/sync-with-upstream: Substitute the path to the root finder in
libstore/gc.cc.
* nix/nix-daemon/guix-daemon.cc (options)[!HAVE_CHROOT]: Mention that
`--disable-chroot' has no effect.
(main)[!HAVE_CHROOT]: Set `useChroot' to false.
* nix/libutil/md5.h (MD5_Final): Pass RESBUF as the first argument to
`guix_hash_final'.
* nix/libutil/sha1.h (SHA1_Final): Likewise.
* nix/libutil/sha256.h (SHA256_Final): Likewise.