Incorrect output buffering check on system requirements installation step

[Alexander Obuhovich]

I've noticed, that on system requirements step introduced in 5.2.0 check for output_buffering setting is made incorrectly.

Right now it's only check to be a positive number, but we also should check for "On" value, which means that buffering is enabled and no memory limit set to it.

Task: http://tracker.in-portal.org/view.php?id=1409

Ready for testing.

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