Remove qFill usages from the generic unix theme

QtAlgorithms is getting deprecated,
see http://www.mail-archive.com/development@qt-project.org/msg01603.html

Change-Id: I23719468e22e256caad977fce6c908059d4073ca
Reviewed-by: J-P Nurmi <jpnurmi@digia.com>
qdatetime: fix build on iOS

Change-Id: I7c6225c54a863f29aa747caf2f57303b2bf6c398
Reviewed-by: John Layt <jlayt@kde.org>
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>