Config: Add macro to update automake scripts on aarch64

Some packages ship an older version which does not recognise
aarch64. To overcome this, we just update these scripts when
necessary.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

lfs/Config

@@ -229,5 +229,13 @@ define INSTALL_INITSCRIPT
 	install -m 754 -v $(DIR_SRC)/src/initscripts/packages/$(1)  /etc/rc.d/init.d/$(1)
 endef
 
+ifeq "$(BUILD_ARCH)" "aarch64"
+define UPDATE_AUTOMAKE
+	for i in $$(find $(DIR_APP) -name config.guess -o -name config.sub); do \
+		cp -vf /usr/share/automake*/$$(basename $${i}) $${i}; \
+	done
+endef
+endif
+
 test:
 	$(call INSTALL_INITSCRIPT,hostapd)