Includes of moc files are not considered while determining the new
include's position. Further the new include is inserted at its
"alphabeticaly sorted" position.

Task-number: QTCREATORBUG-8871
Change-Id: I67b40a6f538112753298b960da488e24f4643808
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>