Fix bug introduced by refactoring of BuildSteps
Fix bug introduced by refactoring of BuildSteps

setClean(true) doens't imply a clean argument anymore. (To make it user
configurable.)

Reviewed-By: owolff

amyvmiwei/qt-creator,jonnor/qt-creator,amyvmiwei/qt-creator,syntheticpp/qt-creator,bakaiadam/collaborative_qt_creator,syntheticpp/qt-creator,richardmg/qtcreator,martyone/sailfish-qtcreator,darksylinc/qt-creator,enricoros/k-qt-creator-inspector,pcacjr/qt-creator,bakaiadam/collaborative_qt_creator,richardmg/qtcreator,sandsmark/qtcreator-minimap,omniacreator/qtcreator,sandsmark/qtcreator-minimap,enricoros/k-qt-creator-inspector,farseerri/git_code,ostash/qt-creator-i18n-uk,martyone/sailfish-qtcreator,amyvmiwei/qt-creator,hdweiss/qt-creator-visualizer,martyone/sailfish-qtcreator,yinyunqiao/qtcreator,dmik/qt-creator-os2,pcacjr/qt-creator,xianian/qt-creator,farseerri/git_code,amyvmiwei/qt-creator,pcacjr/qt-creator,enricoros/k-qt-creator-inspector,sandsmark/qtcreator-minimap,kuba1/qtcreator,darksylinc/qt-creator,azat/qtcreator,AltarBeastiful/qt-creator,amyvmiwei/qt-creator,malikcjm/qtcreator,kuba1/qtcreator,martyone/sailfish-qtcreator,dmik/qt-creator-os2,omniacreator/qtcreator,pcacjr/qt-creator,malikcjm/qtcreator,farseerri/git_code,bakaiadam/collaborative_qt_creator,ostash/qt-creator-i18n-uk,KDAB/KDAB-Creator,KDAB/KDAB-Creator,colede/qtcreator,malikcjm/qtcreator,duythanhphan/qt-creator,KDE/android-qt-creator,richardmg/qtcreator,Distrotech/qtcreator,Distrotech/qtcreator,xianian/qt-creator,bakaiadam/collaborative_qt_creator,dmik/qt-creator-os2,yinyunqiao/qtcreator,KDAB/KDAB-Creator,sandsmark/qtcreator-minimap,AltarBeastiful/qt-creator,colede/qtcreator,danimo/qt-creator,ostash/qt-creator-i18n-uk,yinyunqiao/qtcreator,kuba1/qtcreator,KDE/android-qt-creator,azat/qtcreator,danimo/qt-creator,maui-packages/qt-creator,enricoros/k-qt-creator-inspector,sandsmark/qtcreator-minimap,martyone/sailfish-qtcreator,enricoros/k-qt-creator-inspector,xianian/qt-creator,jonnor/qt-creator,danimo/qt-creator,maui-packages/qt-creator,colede/qtcreator,colede/qtcreator,maui-packages/qt-creator,richardmg/qtcreator,darksylinc/qt-creator,KDE/android-qt-creator,renatofilho/QtCreator,KDAB/KDAB-Creator,richardmg/qtcreator,colede/qtcreator,duythanhphan/qt-creator,Distrotech/qtcreator,danimo/qt-creator,xianian/qt-creator,martyone/sailfish-qtcreator,darksylinc/qt-creator,KDE/android-qt-creator,ostash/qt-creator-i18n-uk,richardmg/qtcreator,syntheticpp/qt-creator,KDE/android-qt-creator,colede/qtcreator,omniacreator/qtcreator,KDAB/KDAB-Creator,martyone/sailfish-qtcreator,KDE/android-qt-creator,azat/qtcreator,Distrotech/qtcreator,amyvmiwei/qt-creator,darksylinc/qt-creator,enricoros/k-qt-creator-inspector,duythanhphan/qt-creator,pcacjr/qt-creator,omniacreator/qtcreator,kuba1/qtcreator,colede/qtcreator,syntheticpp/qt-creator,amyvmiwei/qt-creator,jonnor/qt-creator,KDE/android-qt-creator,renatofilho/QtCreator,malikcjm/qtcreator,hdweiss/qt-creator-visualizer,darksylinc/qt-creator,dmik/qt-creator-os2,omniacreator/qtcreator,syntheticpp/qt-creator,pcacjr/qt-creator,xianian/qt-creator,xianian/qt-creator,xianian/qt-creator,AltarBeastiful/qt-creator,farseerri/git_code,Distrotech/qtcreator,duythanhphan/qt-creator,martyone/sailfish-qtcreator,hdweiss/qt-creator-visualizer,farseerri/git_code,maui-packages/qt-creator,jonnor/qt-creator,azat/qtcreator,AltarBeastiful/qt-creator,dmik/qt-creator-os2,renatofilho/QtCreator,xianian/qt-creator,duythanhphan/qt-creator,kuba1/qtcreator,Distrotech/qtcreator,danimo/qt-creator,kuba1/qtcreator,amyvmiwei/qt-creator,yinyunqiao/qtcreator,xianian/qt-creator,syntheticpp/qt-creator,yinyunqiao/qtcreator,bakaiadam/collaborative_qt_creator,omniacreator/qtcreator,farseerri/git_code,farseerri/git_code,kuba1/qtcreator,sandsmark/qtcreator-minimap,danimo/qt-creator,martyone/sailfish-qtcreator,duythanhphan/qt-creator,jonnor/qt-creator,yinyunqiao/qtcreator,duythanhphan/qt-creator,renatofilho/QtCreator,richardmg/qtcreator,AltarBeastiful/qt-creator,darksylinc/qt-creator,KDAB/KDAB-Creator,kuba1/qtcreator,ostash/qt-creator-i18n-uk,malikcjm/qtcreator,syntheticpp/qt-creator,azat/qtcreator,malikcjm/qtcreator,hdweiss/qt-creator-visualizer,jonnor/qt-creator,dmik/qt-creator-os2,dmik/qt-creator-os2,enricoros/k-qt-creator-inspector,bakaiadam/collaborative_qt_creator,AltarBeastiful/qt-creator,malikcjm/qtcreator,danimo/qt-creator,maui-packages/qt-creator,maui-packages/qt-creator,renatofilho/QtCreator,omniacreator/qtcreator,kuba1/qtcreator,AltarBeastiful/qt-creator,Distrotech/qtcreator,hdweiss/qt-creator-visualizer,bakaiadam/collaborative_qt_creator,pcacjr/qt-creator,danimo/qt-creator,maui-packages/qt-creator,darksylinc/qt-creator,azat/qtcreator,hdweiss/qt-creator-visualizer,danimo/qt-creator,yinyunqiao/qtcreator,KDE/android-qt-creator,ostash/qt-creator-i18n-uk,AltarBeastiful/qt-creator,farseerri/git_code,renatofilho/QtCreator,ostash/qt-creator-i18n-uk