build: Add KBUILD_HOSTLDLIBS

In Linux kernel commit 8377bd2b9ee1 ("kbuild: Rename HOST_LOADLIBES to
KBUILD_HOSTLDLIBS") HOST_LOADLIBES was renamed to KBUILD_HOSTLDLIBS.
This patch adapts the OpenWrt kernel build to this new variable. Without
this change the kernel host tools would not link against the libraries
found in the staging directory.

Signed-off-by: Hauke Mehrtens <hauke.mehrtens@intel.com>

include/kernel.mk

@@ -114,6 +114,7 @@ KERNEL_MAKE_FLAGS = \
 	KBUILD_BUILD_TIMESTAMP="$(KBUILD_BUILD_TIMESTAMP)" \
 	KBUILD_BUILD_VERSION="0" \
 	HOST_LOADLIBES="-L$(STAGING_DIR_HOST)/lib" \
+	KBUILD_HOSTLDLIBS="-L$(STAGING_DIR_HOST)/lib" \
 	CONFIG_SHELL="$(BASH)" \
 	$(if $(findstring c,$(OPENWRT_VERBOSE)),V=1,V='') \
 	$(if $(PKG_BUILD_ID),LDFLAGS_MODULE=--build-id=0x$(PKG_BUILD_ID)) \