Update Qt5 to 5.7.1, and unify the Qt4 and Qt5 ports some more

* Update Qt5 to 5.7.1
* Move Qt4 binaries to lib/qt4/bin
* Move Qt5 libraries to lib/qt5/lib
  By moving the libraries we should finally be able to get rid of the inplace
  upgrade bug (see ports bugs 194088, 195105 and 198720):  when Qt5's libraries
  were lying in /usr/local/lib, which would often get added by pkgconfig to the
  linker paths via dependencies, the already installed libraries were linked
  against, instead of the ones that were being built. This forced us to make
  sure, that -L${WRKSRC}/lib was always coming before -L/usr/local/lib in the
  linker flags. With this change this should no longer be the case.
* Rename some ports to match the rest (foo-qtX -> qtX-foo)
* Depend on new port misc/qtchooser [see UPDATING & CHANGES]

There are several new Qt5 ports which all have been created by Marie Loise
Nolden
<nolden@kde.org>. Thanks again.

PR:		216797
Exp-Run by:	antoine
Reviewed by:	rakuco, mat, groot_kde.org
Approved by:	rakuco (mentor)
Differential Revision:	https://reviews.freebsd.org/D9213

www/webkit-qt4: unbreak with clang 4.0

html/HTMLImageElement.cpp:77:24: error: ordered comparison between pointer and
zero ('const int *' and 'int')
    if (optionalHeight > 0)
        ~~~~~~~~~~~~~~ ^ ~

PR:		216015
Regressed by:	https://github.com/llvm-mirror/clang/commit/4b6ad14285f3
Obtained from:	upstream (excerpt)
Approved by:	portmgr blanket

Remove ${PORTSDIR}/ from dependencies, categories v, w, x, y, and z.

With hat:	portmgr
Sponsored by:	Absolight

Update the Qt4 ports to 4.8.7.

According to upstream, this is the last planned Qt4 release.
A list of changes since 4.8.6 can be found here:
<http://download.qt.io/official_releases/qt/4.8/4.8.7/changes-4.8.7>

Porting notes and changes:
- Remove several patches that have been upstreamed.
- Make Uses/qmake.mk pass the contents of LIBS to the qmake environment. [1]
- Repurpose devel/qt4/files/extrapatch-src-corelib-global-qglobal.h now the
  original patch is part of the release (curiously enough, the original
  patch was never actually used, as the ?= assignment in r362837 after
  r362770 was never possible).

  This works around the way compiler support for C++11 features is detected

Remove @dirrm and @dirrmtry entries from the Qt ports.

Update the default version of GCC in the Ports Collection from GCC 4.7.4
to GCC 4.8.3.

Part II, Bump PORTREVISIONs.

PR:		192025
Tested by:	antoine (-exp runs)
Approved by:	portmgr (implicit)

Remove libtool .la files from all Qt ports

Approvedy by:	kde (makc)

The KDE on FreeBSD team presents Qt 4.8.6.

This is a minor bugfix release that fortunately contains quite a few patches
that we have upstreamed in the past months.

See http://blog.qt.digia.com/blog/2014/04/24/qt-4-8-6-released/ for a
summary of changes, and
http://download.qt-project.org/official_releases/qt/4.8/4.8.6/changes-4.8.6
for a detailed list of changes.

This patch contains commits by me, makc@ and Schaich Alonso.

PR:		ports/189213

Allow webkit-qt4 to build on powerpc64, like was done for webkit-gtk[23].

Submitted by:	Nathan Whitehorn
Approved by:	kde (rakuco)

In preparation for Qt 5 ports:

Mk/Uses/qmake.mk:
- Add support for out-of-source builds
- Add support for Qt 5 ports
- Respect WITH_DEBUG

Mk/bsd.qt.mk:
- Massive rework for Qt 5 ports
- Remove '-phonon' from global configure args, thus allow qt4-designer and
  qt4-qtconfig to be built without Phonon support [1]

devel/qmake4:
- Improve mkspecs for gcc (mainly sync with linux version) and clang