python: add dependency to bz2 host build

Signed-off-by: John Crispin <blogic@openwrt.org>

lang/python/Makefile

@@ -28,7 +28,7 @@ HOST_BUILD_PARALLEL:=1
 PKG_BUILD_DIR:=$(BUILD_DIR)/Python-$(PKG_VERSION)
 HOST_BUILD_DIR:=$(BUILD_DIR_HOST)/Python-$(PKG_VERSION)
 
-PKG_BUILD_DEPENDS:=python/host
+PKG_BUILD_DEPENDS:=libbz2/host python/host
 
 include $(INCLUDE_DIR)/host-build.mk
 include $(INCLUDE_DIR)/package.mk