Fix CDB detection for Windows SDK 8.1
Fix CDB detection for Windows SDK 8.1

Change-Id: Ia39b736acb8ee9d35a6ee213265c780249271c49
Reviewed-by: Friedemann Kleint <1b9f2592239daaec4856ccc1cfb4d2d55b35fb71@digia.com>
Reviewed-by: Joerg Bornemann <47777b9406dbddd02a3fdca8341789a013805a11@digia.com>

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