cmake: Doc should depend on qbs_processlauncher
cmake: Doc should depend on qbs_processlauncher

Amends b946dd352114e70bee5203ea02bb7be11f8ab998.

Change-Id: I89b4fd32b1087f542678aab34a208e6c5eee9c12
Reviewed-by: Eike Ziller <c142da16c73a95a82d35191bcc55b22835617128@qt.io>

qtproject/qt-labs-qbs,qtproject/qt-labs-qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qt-labs/qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qt-labs/qbs,qt-labs/qbs,qtproject/qt-labs-qbs