This reverts commit a647004d (which
is a backport of 88a8feea). After the
5.9.0 release, we've found that changing the algorithm is a bad
idea. It's true that Qt hasn't calculated SHA-3, but it's calculated
something and people may be using it. Keeping a consistent calculation
is better for the 5.6 LTS.
Reviewed-by: Lars Knoll <firstname.lastname@example.org>