Fix build of Designer plugin against Qt 5 stable.
Fix build of Designer plugin against Qt 5 stable.

Change-Id: I53a6b49ff408c73d7532701a0b9eb5ed2c9aca6b
Reviewed-by: Oswald Buddenhagen <6a8868beda3e139b5ac22b2534a23d3e6ba81819@digia.com>

amyvmiwei/qt-creator,xianian/qt-creator,Distrotech/qtcreator,maui-packages/qt-creator,darksylinc/qt-creator,AltarBeastiful/qt-creator,farseerri/git_code,omniacreator/qtcreator,xianian/qt-creator,Distrotech/qtcreator,darksylinc/qt-creator,richardmg/qtcreator,Distrotech/qtcreator,darksylinc/qt-creator,maui-packages/qt-creator,martyone/sailfish-qtcreator,kuba1/qtcreator,AltarBeastiful/qt-creator,farseerri/git_code,AltarBeastiful/qt-creator,colede/qtcreator,darksylinc/qt-creator,malikcjm/qtcreator,xianian/qt-creator,martyone/sailfish-qtcreator,xianian/qt-creator,darksylinc/qt-creator,amyvmiwei/qt-creator,colede/qtcreator,Distrotech/qtcreator,farseerri/git_code,richardmg/qtcreator,kuba1/qtcreator,richardmg/qtcreator,martyone/sailfish-qtcreator,danimo/qt-creator,farseerri/git_code,farseerri/git_code,maui-packages/qt-creator,malikcjm/qtcreator,maui-packages/qt-creator,maui-packages/qt-creator,danimo/qt-creator,xianian/qt-creator,amyvmiwei/qt-creator,malikcjm/qtcreator,AltarBeastiful/qt-creator,malikcjm/qtcreator,darksylinc/qt-creator,AltarBeastiful/qt-creator,omniacreator/qtcreator,omniacreator/qtcreator,Distrotech/qtcreator,danimo/qt-creator,danimo/qt-creator,amyvmiwei/qt-creator,martyone/sailfish-qtcreator,kuba1/qtcreator,danimo/qt-creator,amyvmiwei/qt-creator,richardmg/qtcreator,AltarBeastiful/qt-creator,colede/qtcreator,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,malikcjm/qtcreator,danimo/qt-creator,martyone/sailfish-qtcreator,richardmg/qtcreator,kuba1/qtcreator,richardmg/qtcreator,omniacreator/qtcreator,AltarBeastiful/qt-creator,colede/qtcreator,kuba1/qtcreator,xianian/qt-creator,farseerri/git_code,xianian/qt-creator,malikcjm/qtcreator,xianian/qt-creator,omniacreator/qtcreator,kuba1/qtcreator,Distrotech/qtcreator,amyvmiwei/qt-creator,kuba1/qtcreator,martyone/sailfish-qtcreator,malikcjm/qtcreator,martyone/sailfish-qtcreator,xianian/qt-creator,amyvmiwei/qt-creator,kuba1/qtcreator,Distrotech/qtcreator,farseerri/git_code,colede/qtcreator,omniacreator/qtcreator,farseerri/git_code,amyvmiwei/qt-creator,colede/qtcreator,richardmg/qtcreator,danimo/qt-creator,maui-packages/qt-creator,danimo/qt-creator,danimo/qt-creator,colede/qtcreator,kuba1/qtcreator,AltarBeastiful/qt-creator,darksylinc/qt-creator,maui-packages/qt-creator,darksylinc/qt-creator,omniacreator/qtcreator