nmh AFS fix

This patch fixes a bug where nmh was setting the READONLY flag for a folder in read_folder even when you do have write access to the folder

A patch is against the dev-20010317 version of nmh as found in ftp://ftp.debian.org/debian/pool/main/n/nmh/:

nmh-afs-patch

A patch against 1.1-RC3 (found at http://www.nongnu.org/nmh/
nmh-afs-patch.11rc3

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