ola: needs host-bison and host-flex

Fixes:
http://autobuild.buildroot.net/results/385/385f05b5e1b023b6c4ca220aab897e400b5aeccb/
and a future failure (host-bison).

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

package/ola/ola.mk

@@ -12,7 +12,7 @@ OLA_LICENSE_FILES = LICENCE GPL LGPL
 OLA_INSTALL_STAGING = YES
 
 # util-linux provides uuid lib
-OLA_DEPENDENCIES = protobuf util-linux
+OLA_DEPENDENCIES = protobuf util-linux host-bison host-flex
 
 OLA_CONF_OPT = \
 	--disable-gcov \