dirstate-tree: Ignore FIFOs etc. in the status algorithm
If a filesystem directory contains anything that is not:
* a "normal" file
* a symbolic link
* or a directory
… act as if that directory entry was not there. For example, if that path was
previously a tracked file, mark it as deleted or removed.
Differential Revision: https://phab.mercurial-scm.org/D10548
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