Check if file is present instead of directory
Fixes #8886.
Problem: any `sync-all` command that is run before the first succesfull
`sync-all get` would trigger a false warning about an old `time` package
being present.
Cause: after cloning the ghc repository, the (empty) `libraries/time`
directory is already present.
Solution: check if the directory actually contains any of the `time`
files. I picked the `LICENSE` file, since `boot` does so as well.
Signed-off-by:
Austin Seipp <austin@well-typed.com>
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