avrdude: add missing dependencies on host-flex and host-bison

Fixes:

  http://autobuild.buildroot.org/results/374/374608a852e66b89d02bbee1199a8dc9817d3aa0/build-end.log

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/avrdude/avrdude.mk

@@ -12,7 +12,8 @@ AVRDUDE_SUBDIR = avrdude
 # Sources coming from git, without generated configure and Makefile.in
 # files.
 AVRDUDE_AUTORECONF = YES
-AVRDUDE_DEPENDENCIES = libelf libusb libusb-compat ncurses
+AVRDUDE_DEPENDENCIES = libelf libusb libusb-compat ncurses \
+	host-flex host-bison
 
 ifeq ($(BR2_PACKAGE_LIBFTDI),y)
 AVRDUDE_DEPENDENCIES += libftdi