Revision 407169

Update Qt5 to 5.5.1.

This is the latest stable release at time of writing.

Release announcement: http://blog.qt.io/blog/2015/07/01/qt-5-5-released/
New features in Qt 5.5: https://wiki.qt.io/New_Features_in_Qt_5.5

As usual, huge thanks to Tobias Berner (tcberner@gmail.com) for all his work
on these ports in kde@'s experimental area51 repository. He's the one who
started the update and did a lot of the initial work on Qt 5.5. Ralf Nolden
(nolden@kde.org) has contributed the initial version of most of our new Qt5
ports.

Also thanks to Yuri Victorovich (yuri@rawbw.com) for contributing PR 205805
with his own patch for the 5.5.1 update. Some of his changes there prompted
additional fixes and changes present in the final patch generated from our
experimental repository.

New ports:
- comms/qt5-connectivity, comms/qt5-sensors, devel/qt5-location,
  graphics/qt5-3d, net/qt5-enginio, x11-toolkits/qt5-canvas3d,
  x11-toolkits/qt5-uiplugin.

General changes in all Qt5 ports:
- All Qt5 ports are now built with -Wl,--as-needed to avoid overlinking,
  which is a problem with qmake-based because the libraries passed to the
  linker come from the modules .pri files and many are not necessary.
- With this change, several ports had their USE_QT5 lines adjusted to
  explicitly include some libraries that were pulled in implicitly, and to
  exclude libraries no longer required with -Wl,--as-needed.

Changes in specific ports:
- devel/qt5: Drop the SQL_PLUGINS and TOOLS options and depend on all Qt5
  ports by default. It makes the Makefile much simpler, and those options
  were already on by default.
- devel/qt5-core: The clang+base libstdc++ workaround has been expanded and
  more C++11 features have been disabled when that combination is used by a
  port (basically, FreeBSD 9 with USES=compiler:c++11-lang). The disabled
  features have explanations for why they were disabled in the patched
  header itself.
- devel/qt5-designer: uiplugins has been split out following a similar
  change upstream. By depending on qt5-uiplugin, qt5-uitools avoids having
  to depend on the big qt5-designer port.
- multimedia/qt5-multimedia: The port now uses GStreamer 1.0 instead of
  0.10.
- net/qt5-network: The port now depends on libproxy for proxy settings.
  Using libproxy allows proxy settings to be read from different sources,
  and also allows .pac files to work with Qt.
- www/qt5-webkit: The port now uses GStreamer 1.0 instead of 0.10.

PR:		205805
PR:		206435