casa-mp-base

gpsd: update to 3.18.1

This is essentially the same as the 3.18 port, but for the new
version.

The upstream code as patched by the port can also be seen at:

    https://github.com/fhgwright/gpsd/tree/macports-3.18.1

The -devel version is pointing at the upstream sources as of
21-Nov-2018.  Since all needed patches are included upstream
at that point, there are no patches for it in the port.

TESTED:
Used "port test" and "port install" as the primary test, with the
default variants, all binary variants with the default python27, each
single binary variant with the default python27, and all binary
variants with each non-default python.  Ran this on a MacPro/10.9, a
MacPro/10.14, a MacBook Pro/10.9, a PowerBook G4/10.5, and VMs for all
10.5-10.13 versions, except that, due to test flakiness on the
PowerBook, "port test" was skipped in most PowerBook cases.  This was
all done for both the normal and -devel ports, except that the -devel
version had test issues on 10.5 x86, so those tests were also skipped.