wxPython: Fix sums
binutils: Update to 2.25
gxml: Update version
xz: Update to 5.2.0
gettext: Update to 0.19.4
libpng: Update to 1.6.16
ffmpeg: Update to 2.5.2
gstreamer: Update to 1.4.5
libssh: Update to 0.6.4. Fix pkg-config files, fix cmake files.
setuptools: Update to 8.2.1
pip: Update to 6.0.3
openscad-git: Fix building.
openscad-git: Fix version scheme. Don't need patch anymore
python2: Fix importing SSL module.
python-httplib2: New package.
binutils-git: Don't replace binutils as it newer.
binutils-git: Update to 2-25-branch
binutils: Build gold linker.
TODO.md: Add some 3D engines
qt5-static: More cmake-static work (WIP)

Plugin .prl files are read and the (linker) flags specified in
QMAKE_PRL_LIBS_FOR_CMAKE are added to INTERFACE_LINK_LIBRARIES
as is the full path for the static library that is each plugin

To complete this task we need to create the exe_plugin_import.cpp
file and add it to the executable target. The contents need to be:

// This file is autogenerated by cmake. It imports static plugin classes for
// static plugins specified using QTPLUGIN and QT_PLUGIN_CLASS.<plugin> variables.
Q_IMPORT_PLUGIN(QWindowsIntegrationPlugin)
Q_IMPORT_PLUGIN(QDDSPlugin)
..
..
Q_IMPORT_PLUGIN(QLastPlugin)