collectd: fix build with latest gpsd

collectd: fix build with latest gpsd

The last bump of gpsd to version 3.18 broke the build due to a change
in the gps_read() prototype. Add a patch fixing that.

Fixes:
http://autobuild.buildroot.net/results/b08/b0829bc3343d6dc3065078e94896725b1c808bc1/
http://autobuild.buildroot.net/results/1a6/1a6f2fcf1a88ecc5b598dd11c5914dcacf0e1e6b/
http://autobuild.buildroot.net/results/63a/63a4f980d7cdb4b0823840f747589803fcd0d69f/

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>