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Use RESOLVE_NO_SYMLINKS on Linux when following symlinks is disabled #383

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This addresses a bug where a forward slash is the last element of a symlink directory path and open_dir_nofollow is used.

If a symlink is created to a directory without specifying an absolute path, then the path behind the symlink does not error when opened with open_dir_nofollow.

Take these two symlinks:

> ls -l /home/ylk/test-dir-symlink*
lrwxrwxrwx 1 ylk ylk 24 Feb 19 21:15 /home/ylk/test-dir-symlink ->
/local/home/ylk/test-dir/
lrwxrwxrwx 1 ylk ylk 8 Feb 19 21:27 /home/ylk/test-dir-symlink2 ->
test-dir/

Without this patch, the following behavior is observed when using open_dir_nofollow:

test-dir-symlink/ -> error
test-dir-symlink -> error
test-dir-symlink2 -> error
test-dir-symlink2/ -> no error

This addresses a bug where a forward slash is the last element of a
symlink directory path and `open_dir_nofollow` is used.

If a symlink is created to a directory without specifying an absolute
path, then the path behind the symlink does not error when opened
with `open_dir_nofollow`.

Take these two symlinks:

```
> ls -l /home/ylk/test-dir-symlink*
lrwxrwxrwx 1 ylk ylk 24 Feb 19 21:15 /home/ylk/test-dir-symlink ->
/local/home/ylk/test-dir/
lrwxrwxrwx 1 ylk ylk 8 Feb 19 21:27 /home/ylk/test-dir-symlink2 ->
test-dir/
```

Without this patch, the following behavior is observed when using
open_dir_nofollow:

test-dir-symlink/ -> error
test-dir-symlink -> error
test-dir-symlink2 -> error
test-dir-symlink2/ -> **no error**
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