build: drop HOST_LOADLIBES

HOST_LOADLIBES was renamed to KBUILD_HOSTLDLIBS in kernel 4.19. As the
oldest kernel version we support is 5.10, cleanup HOST_LOADLIBES use.

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>

include/kernel.mk

@@ -110,7 +110,6 @@ KERNEL_MAKE_FLAGS = \
 	KBUILD_BUILD_HOST="$(call qstrip,$(CONFIG_KERNEL_BUILD_DOMAIN))" \
 	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='') \