gpsd: bump version to 3.8

Version 3.8 of gpsd has been released, which includes some patches sent
upstream by Thomas Petazzoni. This patch bumps the gpsd package version,
and removes the upstreamed patches.

Signed-off-by: Simon Dawson <spdawson@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>