MFH: r517791

comms/iwmbt-firmware: Unbreak fetch

Future consideration for maintainer: include the "-2" portion of the
DISTNAME as part of the PORTVERSION parameter. This would also require
PORTEPOCH to be bumped as version 20190717 is considered greater than
20190717-2 by pkg-version(8).

Approved by: portmgr blanket

Approved by: portmgr (blanket - build fix)