system/coreutils: revert gnulib getcwd optimization. fixes #985, #987.

This commit reverts a commit in gnulib in coreutils that caused a
functional change between coreutils { 9.1 --> 9.2 }.

tl;dr:

  * on some systems, `(cd //tmp && /bin/pwd)` may return '/tmp' or
    '//tmp' depending on several factors; this is generally OK

  * in a musl-based Adélie environment, we identified a change in
    this behavior between coreutils updates during testing

  * the functional change was bisected to coreutils commit
    d42e4e9191abb818fc0e28507085a3945eed1477, which itself bumps
    the gnulib submodule, and is unrelated to coreutils itself

  * gnulib commit 356a414e8c15ef3f8cc7b7157427c8ce9a9f7c1b has been
    identified as the culprit for this functional change

See #987 for more information.

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