Fix QFile::map in Linux 64bit
Fix QFile::map in Linux 64bit

On 64bit, qint64(size_t(-1)) = -1

Reviewed-by: Joao
Reviewed-by: Thiago
(cherry picked from commit 829d9e10ad3d26fb2fddef01c8e36352018c3fec)
(cherry picked from commit c71c46430317b70e784f0952d0aac048775ad842)

igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,igor-sfdc/qt-wk,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt