[macports-base] branch master updated (328eb95 -> 16d48a9)

[Clemens Lang]

Clemens Lang (neverpanic) pushed a change to branch master
in repository macports-base.

    from 328eb95  Add script to set cxx_stdlib_overridden on upgrade
     new d49c4fb  portindex: support creating PortIndex for libc++
     new 16d48a9  portindex: Fix cxx_stdlib default for darwin < 13

The 2 revisions listed above as "new" are entirely new to this
repository and will be described in separate emails.  The revisions
listed as "add" were already present in the repository and have only
been added to this reference.


Summary of changes:
 src/port/portindex.tcl | 33 +++++++++++++++++++++++++++++----
 1 file changed, 29 insertions(+), 4 deletions(-)