With this, each rotation = 0 / 90 / 180 / 270 and flip = none /
horizontal / vertical / horizontal+vertical combination (16 cases) are
exported perfectly.

Also, this matches what the (binary) [MS-ODRAW] export does, see
ImplEESdrWriter::ImplWriteShape().

Change-Id: I04030c8c6819c35c06ce97400eb7e2f1f7389a5f