[MacPorts] #55822: Upgrade outdated fails building libtorrent

[MacPorts]

#55822: Upgrade outdated fails building libtorrent
-----------------------+-------------------
 Reporter:  borgo1971  |      Owner:
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.4.2
 Keywords:             |       Port:
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 I tried more time to upgrade outdated files (selfupdate says to do this),
 but can't end with success the procedure.

 $ sudo port upgrade outdated
 --->  Computing dependencies for libtorrent
 --->  Building libtorrent
 Error: Failed to build libtorrent: command execution failed
 Error: See
 /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_net_libtorrent/libtorrent/main.log
 for details.
 Error: Follow https://guide.macports.org/#project.tickets to report a bug.

 MacPro 2009 with macOS 10.11.6

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Ticket URL: <https://trac.macports.org/ticket/55822>
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