Stiopa Koltsov 0ecf74e434 System.Directory.nextDirEntry ...

* add `nextDirEntry` which returns `Maybe String`, so `Nothing` on
  the end of directory unlike `dirEntry` which returns unspecified error
  on the end of directory
* `dirEntry` is deprecated now, but not removed because compiler depends on it
* native implementation of `dirEntry` is patched to explicitly reset `errno`
  before the `readdir` call: without it end of directory and error were
  indistinguishable
* test added

2021-07-17 14:57:27 +01:00

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