[msi/tests 3/3] Create a system restore point when needed

[Paul Vriens]

Hi,

The slowness on some machines for the install tests comes from the system
restore facility. When 'System Restore' is active you will find a great number
of system restore points after these tests have run. Adding our own system
restore point circumvents this as Windows will now wait till we tell it that the
   system change has ended. Only 1 system restore point will be created now and
this one is nicely removed afterwards.

On my testboxes (XP and Vista) this makes sure that the tests run within the
limits of the timeout (2 minutes). Before this patch the tests would take about
8 minutes on my Vista box (now 1.something).

Changelog
   Create a system restore point when needed

-- 
Cheers,

Paul.

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