Compile ServerBuffer client example on desktop gl

Change-Id: I8efbda3e5266c5668b2461429a21d900e2ecd175
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>
Fixup for GLX integration

Change-Id: I2de94481f7d3e109fdce7ca961f8969299cf5d9e
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>
Take advantage of the Qt 5 plugin json structure

Also change naming scheme of plugins:
buffer integrations doesn't start with "wayland-" but the platform
plugins have to start with "wayland-".

Also update the README

Change-Id: I6dd2103ab287ed569ab06cfb6eb469e3db058831
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>
Flush the clients connection after sending the frame callbacks

We want to make sure the events reach the clients asap.

Change-Id: I0783c6be4f4412fd5f3665faec1e57d141291ce7
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>