This Qt release "pluginized" the backends for TLS support so we need to
make sure to link against at least one TLS plugin since all of my
applications which use Qt Network expect TLS to work.
* Fix missing "Vista style" in static, Qt 5.10 based
Windows build
* Required since the platform styles have been
"pluginized" in Qt 5.10
* See 4f3249f32d
* Only link targets using static Qt Gui/Widgets/Quick
against static plugins since currently only GUI-related
plugins are relevant
* Don't require to link explicitely against the related
module (eg. Qt Svg for the Svg icon engine) because the
imported target of the plugin should pull all required
dependencies
* Add option for linking against static Qt image format
plugins
* Link GUI applications using static Qt Gui/Widgets/Quick
against the static X11 platform integration plugin if it
is available
Martchus