packaging: add ftp.filt, the FTP mirror filter file

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The .filt file in /home/ftp/pub/rsync on samba.org controls which
subtrees release.py's FTP mirror excludes (currently /binaries/
and /generated-files/).  Without it, step-10-push-ftp's
'rsync --del' would propagate local deletions to the server even
for those archive subtrees.

Until now the only copy of this two-line file lived on the server.
Bundle it in source at packaging/ftp.filt so it survives a disaster
on samba.org, and have step_1_fetch seed FTP_DIR/.filt from the
bundled copy on every run (with --exclude=/.filt on the rsync pull,
so the server's copy can't silently drift the bundled one).
step-10-push-ftp then propagates any in-source updates to the
filter back to the server.

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