Add support for QDir::NoDot and QDir::NoDotDot for setFilter in
QFileSystemModel.
Task-number: QTBUG-14760
Reviewed-by: Frederik
(cherry picked from commit b60d82fd56897b1a1d3cc730172f71c27a497ede)
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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12
