uterm: video: improve blitting performance

Turns out gcc didn't optimize this trivial math so we do it by hand. This
reduces the number of divisions per color to 1. This increases performance
by like 15%.

As a second optimization, we replace the division with a left shift, that
is, we divide by 256. Technically, this is wrong as we will get slightly
incorrect results. However, this is hardly noticible by human eye so we
can safely use it. This increases performance by like 20% again.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>

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