Remove qSort usages from the Cocoa helpers

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

Change-Id: I482ce9320c07458a9f76df5823f17d53beec00d8
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>
Remove qFind usages from the XCB plugin

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

Change-Id: Ieccef12c617276d0526ce2876fd76e37b4240a43
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>