Removed the vendored git-lfs and the GitLfs build flag

AFAICS all git-annex builds are using the git-lfs library not the vendored
copy.

Debian stable does have a too old haskell-git-lfs package to be able to
build git-annex from source, but there is not currently a backport of a
recent git-annex to Debian stable. And if they update the backport at some
point, they should be able to backport the library too.

Sponsored-by: Svenne Krap on Patreon

standalone/linux/stack-i386ancient.yaml

@@ -8,7 +8,6 @@ flags:
     dbus: false
     debuglocks: false
     benchmark: false
-    gitlfs: true
 packages:
 - '.'
 extra-deps: