[MacPorts] #62559: libtorrent-rasterbar: request update to 1.2.12

[MacPorts]

#62559: libtorrent-rasterbar: request update to 1.2.12
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 Reporter:  i0ntempest  |      Owner:  (none)
     Type:  update      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  libtorrent-rasterbar
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 Tried to do an trivial update but it didn't work. The patch needs a minor
 change (the easy part) and the build now requires `b2` command, which
 seems to be from `boost` but isn't included in macports `boost`.
 This is also needed by the newest qbittorrent.

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Ticket URL: <https://trac.macports.org/ticket/62559>
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