Passing this flag to QFileDevice::map() will allow writes to the mapped memory
without modifying the file that was mapped. These writes will be lost when the
memory is unmapped.
Change-Id: I7d46b044fc370585de8c06fdb4059f1f1be12d7d
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>