at: needs host-flex and host-bison

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/at/at.mk

@@ -9,7 +9,7 @@ AT_SITE = $(BR2_DEBIAN_MIRROR)/debian/pool/main/a/at
 # missing deps for parsetime.l
 AT_MAKE = $(MAKE1)
 AT_AUTORECONF = YES
-AT_DEPENDENCIES = $(if $(BR2_PACKAGE_FLEX),flex)
+AT_DEPENDENCIES = $(if $(BR2_PACKAGE_FLEX),flex) host-bison host-flex
 
 AT_CONF_OPT = \
         --with-jobdir=/var/spool/cron/atjobs \