Compile with Qt 5.
Compile with Qt 5.

QAbstractFileEngine is private in Qt 5. Protect
the header include statement with a version check.

(The actual QAbstractFileEngine usage in this file
already has a version check).

Change-Id: I0da5fe83547986a12dc51eb430c099c48f7e8e3e
Reviewed-by: Friedemann Kleint <1b9f2592239daaec4856ccc1cfb4d2d55b35fb71@nokia.com>

hdweiss/qt-creator-visualizer,AltarBeastiful/qt-creator,richardmg/qtcreator,farseerri/git_code,maui-packages/qt-creator,jonnor/qt-creator,amyvmiwei/qt-creator,amyvmiwei/qt-creator,omniacreator/qtcreator,farseerri/git_code,malikcjm/qtcreator,amyvmiwei/qt-creator,farseerri/git_code,amyvmiwei/qt-creator,syntheticpp/qt-creator,Distrotech/qtcreator,maui-packages/qt-creator,ostash/qt-creator-i18n-uk,KDAB/KDAB-Creator,AltarBeastiful/qt-creator,amyvmiwei/qt-creator,martyone/sailfish-qtcreator,duythanhphan/qt-creator,KDE/android-qt-creator,syntheticpp/qt-creator,syntheticpp/qt-creator,martyone/sailfish-qtcreator,jonnor/qt-creator,kuba1/qtcreator,colede/qtcreator,darksylinc/qt-creator,danimo/qt-creator,AltarBeastiful/qt-creator,maui-packages/qt-creator,jonnor/qt-creator,KDE/android-qt-creator,Distrotech/qtcreator,farseerri/git_code,KDAB/KDAB-Creator,ostash/qt-creator-i18n-uk,farseerri/git_code,danimo/qt-creator,xianian/qt-creator,danimo/qt-creator,richardmg/qtcreator,KDE/android-qt-creator,martyone/sailfish-qtcreator,jonnor/qt-creator,syntheticpp/qt-creator,KDE/android-qt-creator,colede/qtcreator,syntheticpp/qt-creator,omniacreator/qtcreator,darksylinc/qt-creator,colede/qtcreator,xianian/qt-creator,xianian/qt-creator,danimo/qt-creator,richardmg/qtcreator,jonnor/qt-creator,KDE/android-qt-creator,hdweiss/qt-creator-visualizer,AltarBeastiful/qt-creator,AltarBeastiful/qt-creator,AltarBeastiful/qt-creator,darksylinc/qt-creator,KDE/android-qt-creator,martyone/sailfish-qtcreator,duythanhphan/qt-creator,azat/qtcreator,amyvmiwei/qt-creator,kuba1/qtcreator,omniacreator/qtcreator,KDE/android-qt-creator,colede/qtcreator,azat/qtcreator,omniacreator/qtcreator,AltarBeastiful/qt-creator,Distrotech/qtcreator,hdweiss/qt-creator-visualizer,danimo/qt-creator,maui-packages/qt-creator,omniacreator/qtcreator,kuba1/qtcreator,KDAB/KDAB-Creator,azat/qtcreator,martyone/sailfish-qtcreator,danimo/qt-creator,malikcjm/qtcreator,omniacreator/qtcreator,maui-packages/qt-creator,farseerri/git_code,xianian/qt-creator,hdweiss/qt-creator-visualizer,hdweiss/qt-creator-visualizer,KDAB/KDAB-Creator,azat/qtcreator,hdweiss/qt-creator-visualizer,xianian/qt-creator,xianian/qt-creator,ostash/qt-creator-i18n-uk,farseerri/git_code,darksylinc/qt-creator,duythanhphan/qt-creator,kuba1/qtcreator,danimo/qt-creator,darksylinc/qt-creator,Distrotech/qtcreator,Distrotech/qtcreator,Distrotech/qtcreator,richardmg/qtcreator,danimo/qt-creator,KDE/android-qt-creator,darksylinc/qt-creator,malikcjm/qtcreator,Distrotech/qtcreator,amyvmiwei/qt-creator,malikcjm/qtcreator,azat/qtcreator,farseerri/git_code,kuba1/qtcreator,kuba1/qtcreator,martyone/sailfish-qtcreator,ostash/qt-creator-i18n-uk,duythanhphan/qt-creator,jonnor/qt-creator,colede/qtcreator,ostash/qt-creator-i18n-uk,xianian/qt-creator,amyvmiwei/qt-creator,darksylinc/qt-creator,syntheticpp/qt-creator,colede/qtcreator,martyone/sailfish-qtcreator,xianian/qt-creator,malikcjm/qtcreator,KDAB/KDAB-Creator,xianian/qt-creator,KDAB/KDAB-Creator,syntheticpp/qt-creator,omniacreator/qtcreator,kuba1/qtcreator,martyone/sailfish-qtcreator,maui-packages/qt-creator,maui-packages/qt-creator,kuba1/qtcreator,richardmg/qtcreator,malikcjm/qtcreator,duythanhphan/qt-creator,richardmg/qtcreator,duythanhphan/qt-creator,ostash/qt-creator-i18n-uk,AltarBeastiful/qt-creator,colede/qtcreator,kuba1/qtcreator,duythanhphan/qt-creator,malikcjm/qtcreator,ostash/qt-creator-i18n-uk,richardmg/qtcreator,azat/qtcreator,darksylinc/qt-creator,danimo/qt-creator,martyone/sailfish-qtcreator