[MacPorts] Meetings/MacPortsMeeting2018/Libcxx added

[MacPorts]

Page "Meetings/MacPortsMeeting2018/Libcxx" was added by mojca
Content:
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== Switching to Libc++ on older systems by default ==

Wiki page for the setup: [wiki:LibcxxOnOlderSystems Libc++ on older systems]

Tickets to be addressed:
 * [[TicketQuery(id=50448|55471|53634)]]
See also:
 * [[TicketQuery(id=52000|49903)]]

cxx_stdlib might need to be one additional criteria to respect when selecting an archive site here:
* https://github.com/macports/macports-ports/blob/master/_resources/port1.0/fetch/archive_sites.tcl
* https://github.com/macports/macports-base/blob/995dde8476c48580db4f6eedfde09e90dc5e8c99/src/package1.0/portarchivefetch.tcl#L66
Then the archive site would no longer be used if anyone changes the default in macports.conf.
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