fwts: needs host-bison and host-flex

Fixes:
http://autobuild.buildroot.net/results/2e6bc77e89868d7a9902123ffb602c5b745d4580

Tested in a minimal debian environment, there should be no missing host
package dependencies after these.

Signed-off-by: Erico Nunes <nunes.erico@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/fwts/fwts.mk

@@ -10,7 +10,7 @@ FWTS_STRIP_COMPONENTS = 0
 FWTS_LICENSE = GPLv2, LGPLv2.1, Custom
 FWTS_LICENSE_FILES = debian/copyright
 FWTS_AUTORECONF = YES
-FWTS_DEPENDENCIES = host-pkgconf json-c libglib2 \
+FWTS_DEPENDENCIES = host-bison host-flex host-pkgconf json-c libglib2 \
 	$(if $(BR2_PACKAGE_DTC),dtc)
 
 $(eval $(autotools-package))