fs: Use readdir() instead of readdir_r() on Linux

readdir() is preferred over readdir_r() on Linux and many other
platforms because it more gracefully supports long file names.  Both
glibc and musl (and presumably all other Linux libc implementations)
guarantee that readdir() is thread-safe as long as a single DIR* is not
accessed concurrently, which is enough to make a readdir()-based
implementation of ReadDir safe.  This implementation is already used for
some other OSes including Fuchsia, Redox, and Solaris.

See #40021 for more details.  Fixes #86649.  Fixes #34668.

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