Subj : Add initial support for SFTP
To   : GitLab note in main/sbbs
From : Rob Swindell
Date : Sun Feb 25 2024 18:20:40

https://gitlab.synchro.net/main/sbbs/-/merge_requests/415#note_4906

Replace repeated magic num with symbolic constant.
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 * Origin: Vertrauen - [vert/cvs/bbs].synchro.net (1:103/705)

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