The code that tested for compatible x86 architectures was broken and
only worked by chance because 'uname -m' returned i686 on the older
i586 systems.

The new code is simplified by dropping the exclusion of mdv2011+. We
only test and support upgrades from the previous Mageia release, so
any upgrade from another distribution is unlikely to work cleanly,
and there's no need to single out mdv2011+.

The installer defaults to a 1024x768 screen resoultion, so we need at
least 768 pixels.

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