Do allow people to build from git using the Qt License Agreement 4.0.
The license agreement text is the same as in the installers, except
that some Unicode characters got normalized to their ASCII variants,
and things have been properly wrapped.
[ChangeLog][Licensing] The commercial preview license in the git
checkout has been replaced by the Qt License Agreement 4.0 text.
This makes it explicit that commercial customers of The Qt Company
can use the git version under commercial terms. However, support
is (still) only provided for builds from released branches of Qt.
Reviewed-by: Lars Knoll <firstname.lastname@example.org>