bash: add missing dependency on host-bison

Fixes:
http://autobuild.buildroot.org/results/dfedb4377a95e36e590c9a5a5853e3ed0ecbc247/build-end.log

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

package/bash/bash.mk

@@ -6,7 +6,7 @@
 
 BASH_VERSION = 4.2
 BASH_SITE = $(BR2_GNU_MIRROR)/bash
-BASH_DEPENDENCIES = ncurses
+BASH_DEPENDENCIES = ncurses host-bison
 BASH_LICENSE = GPLv3+
 BASH_LICENSE_FILES = COPYING