[openwrt/openwrt] build: export STAGING_DIR_HOST in toplevel make code

[LEDE Commits]

nbd pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/faf2b2193e28ecf4237c263ce58897cb9170d477

commit faf2b2193e28ecf4237c263ce58897cb9170d477
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Sun Aug 28 20:35:03 2022 +0200

    build: export STAGING_DIR_HOST in toplevel make code
    
    Fixes ncurses pkg-config check for menuconfig
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 include/toplevel.mk | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/toplevel.mk b/include/toplevel.mk
index ce744bc92c..455fc9c4da 100644
--- a/include/toplevel.mk
+++ b/include/toplevel.mk
@@ -60,6 +60,7 @@ endif
 
 SCAN_COOKIE?=$(shell echo $$$$)
 export SCAN_COOKIE
+export STAGING_DIR_HOST=$(TOPDIR)/staging_dir/host
 
 SUBMAKE:=umask 022; $(SUBMAKE)