Log Message:
Update to 1.3.6 from 1.3.4.  Add two patches from Giles Lean to work
around what is believed to be bugs in Prolific USB convertors.  Point
to pkgsrc-hosted distfile because upstream distfile, although
LICENSE=gnu-gpl-v2 is apparently only available via a web form.

Full changes available at
  http://www.gpsbabel.org/changes.html

Notable changes in 1.3.6:
  Fix writing waypoint names under 6 characters to old serial Garmins.

Notable changes in 1.3.5:
  Read waypointsw from jpg/exif.
  Add support for osm (openstreetmap) format files.
  Set computer's clock from GARMIN.