gawk: convert old-style hook to new-style hook

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

package/gawk/gawk.mk

@@ -8,18 +8,19 @@ GAWK_VERSION = 3.1.8
 GAWK_SITE = $(BR2_GNU_MIRROR)/gawk
 GAWK_TARGET_BINS = awk gawk igawk pgawk
 
-$(eval $(call AUTOTARGETS,package,gawk))
-$(eval $(call AUTOTARGETS,package,gawk,host))
-
-$(GAWK_HOOK_POST_INSTALL): $(GAWK_TARGET_INSTALL_TARGET)
+define GAWK_CREATE_SYMLINK
 	ln -sf /usr/bin/gawk $(TARGET_DIR)/usr/bin/awk
-	touch $@
+endef
+
+GAWK_POST_INSTALL_TARGET_HOOKS += GAWK_CREATE_SYMLINK
 
-$(GAWK_TARGET_UNINSTALL):
-	$(call MESSAGE,"Uninstalling")
+define GAWK_UNINSTALL_TARGET_CMDS
 	rm -f $(addprefix $(TARGET_DIR)/usr/bin/, $(GAWK_TARGET_BINS))
 	rm -f $(TARGET_DIR)/usr/share/info/gawk*.info
 	rm -f $(TARGET_DIR)/usr/share/man/man*/*gawk.1
 	rm -rf $(TARGET_DIR)/usr/libexec/awk
 	rm -rf $(TARGET_DIR)/usr/share/awk
-	rm -f $(GAWK_TARGET_INSTALL_TARGET) $(GAWK_HOOK_POST_INSTALL)
+endef
+
+$(eval $(call AUTOTARGETS,package,gawk))
+$(eval $(call AUTOTARGETS,package,gawk,host))