SCI32: Fix video performance benchmarking in most SCI32 games

Most SCI32 games draw a "fred" object to the screen when the game
first starts to benchmark video performance. When framerate
throttling is enabled (which fixes many/most timing-related bugs
and reduces system load caused by unnecessary graphics updates),
the game's performance check will think that video card is slow,
causing some "high-performance" game features to be disabled.

To avoid this, we simply disable throttling during benchmarking by
detecting the "fred" object.

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