gpsd: disable documentation

Fixes:
 - http://autobuild.buildroot.org/results/cbdb4cc34080714082f044fde7e069e6ab5a0e8e

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gpsd/gpsd.mk

@@ -19,6 +19,7 @@ GPSD_SCONS_ENV = $(TARGET_CONFIGURE_OPTS)
 
 GPSD_SCONS_OPTS = \
 	arch=$(ARCH)\
+	manbuild=no \
 	prefix=/usr\
 	sysroot=$(STAGING_DIR)\
 	strip=no\