libconfuse: needs host-flex

Fixes:
http://autobuild.buildroot.net/results/63f/63f6f6204058932b02f79eaaa44eb4555c5bbb1f/

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/libconfuse/libconfuse.mk

@@ -8,6 +8,7 @@ LIBCONFUSE_VERSION = V2_7
 LIBCONFUSE_SITE = $(call github,martinh,libconfuse,$(LIBCONFUSE_VERSION))
 LIBCONFUSE_INSTALL_STAGING = YES
 LIBCONFUSE_CONF_OPT = --disable-rpath
+LIBCONFUSE_DEPENDENCIES = host-flex
 LIBCONFUSE_LICENSE = ISC
 LIBCONFUSE_LICENSE_FILES = src/confuse.c