fs: update cfg attr in fs::read_dir
#5806
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This change updates the cfg attribute to prevent unnecessary file metadata fetching on new targets.
The current
DirEntry::file_typeimplementation returns a pre-parsed value fromfs::read_dirfor most targets. Some Unix operating systems are excluded because of the overhead of fetching metadata to get the file type. However, as the Rust compiler has been updated, new targets have been added and an update is needed. The cfg attribute is taken from the std implementation.Related Issue: #5804