package/: shared config cache is gone

So remove the last references to it.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/gpsd/gpsd.mk

@@ -9,7 +9,6 @@ GPSD_SITE = http://download.berlios.de/gpsd
 GPSD_INSTALL_STAGING = YES
 GPSD_CONF_OPT = --disable-static
 GPSD_LIBTOOL_PATCH = NO
-GPSD_USE_CONFIG_CACHE = NO
 GPSD_TARGET_BINS = cgps gpsctl gpsdecode gpsmon gpspipe gpxlogger lcdgps
 
 # Build libgpsmm if we've got C++

package/rng-tools/rng-tools.mk

@@ -7,7 +7,6 @@
 RNG_TOOLS_VERSION = 3
 RNG_TOOLS_SITE = http://$(BR2_SOURCEFORGE_MIRROR).dl.sourceforge.net/sourceforge/gkernel
 RNG_TOOLS_CONF_ENV = LIBS="-largp"
-RNG_TOOLS_USE_CONFIG_CACHE = NO
 RNG_TOOLS_DEPENDENCIES = argp-standalone
 
 $(eval $(call AUTOTARGETS,package,rng-tools))