Learn to build spice-vdagent MSI installer
Don't refresh displays config when updating

wnd_proc() is called during ChangeDisplaySettings(), when handling
monitors config. However, calling get_displays() will overwrite the
desired config.

So, while updating from 1 to 4 enabled monitors, when the 2nd monitor
config is enabled, the current config is read, and overwrite the rest of
the config, so first time only 2nd monitor is enabled, second time, 3rd
monitor etc.

https://bugzilla.redhat.com/show_bug.cgi?id=1111144
Merge branch 'master' of https://github.com/SPICE/win32-vd_agent