haserl: convert to new style hook

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/haserl/haserl.mk

@@ -22,9 +22,10 @@ ifeq ($(BR2_PACKAGE_HASERL_WITH_LUA),y)
 	HASERL_DEPENDENCIES += lua
 endif
 
-$(eval $(call AUTOTARGETS,package,haserl))
-
-# haserl 0.8.0 installs unneeded examples to /usr/share/haserl - remove them
-$(HASERL_HOOK_POST_INSTALL): $(HASERL_TARGET_INSTALL_TARGET)
+define HASERL_REMOVE_EXAMPLES
 	rm -rf $(TARGET_DIR)/usr/share/haserl
-	touch $@
+endef
+
+HASERL_POST_INSTALL_TARGET_HOOKS += HASERL_REMOVE_EXAMPLES
+
+$(eval $(call AUTOTARGETS,package,haserl))