bpf-headers: 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>

package/kernel/bpf-headers/Makefile

@@ -56,7 +56,6 @@ KERNEL_MAKE := \
 		LLVM=1 CC="$(CLANG)" LD="$(TARGET_CROSS)ld" \
 		HOSTCC="$(HOSTCC)" \
 		HOSTCXX="$(HOSTCXX)" \
-		HOST_LOADLIBES="-L$(STAGING_DIR_HOST)/lib" \
 		KBUILD_HOSTLDLIBS="-L$(STAGING_DIR_HOST)/lib" \
 		CONFIG_SHELL="$(BASH)" \
 		INSTALL_HDR_PATH="$(PKG_BUILD_DIR)/user_headers"