gpsd: add upstream patches

Add a couple of patches submitted by Mike Frysinger to gpsd upstream. One of
these patches (that for the gpsd/dbus interface) fixes autobuild failures
such as the following.

  http://autobuild.buildroot.net/results/41ccc838c5d44ab237a7195767940585bbb8b1f6



Note that neither of these patches has yet been accepted upstream.

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