lm_sensors: needs host-bison and host-flex

Fixes:
http://autobuild.buildroot.net/results/f88461702cd2f249e5d28eeac26f5e4d9edece6d/

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/lm-sensors/lm-sensors.mk

@@ -8,6 +8,7 @@ LM_SENSORS_VERSION = 3.3.3
 LM_SENSORS_SOURCE = lm_sensors-$(LM_SENSORS_VERSION).tar.bz2
 LM_SENSORS_SITE = http://dl.lm-sensors.org/lm-sensors/releases
 LM_SENSORS_INSTALL_STAGING = YES
+LM_SENSORS_DEPENDENCIES = host-bison host-flex
 LM_SENSORS_LICENSE = libsensors LGPLv2.1+, programs GPLv2+
 LM_SENSORS_LICENSE_FILES = COPYING.LGPL COPYING