Avoid chdir()ing in sync_deps()

Temporarily changing the working directory is iffy if threads are
involved, since other code will see the change. Seems like a generally
rude thing for a random library function to do.

dir_fd (open() relative to directory) is another option, but it's Python
3 only, only available on the low-level os.open() interface, and might
not be universally supported.

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