include/package-pack: add support for postrm with APK

Currently, postrm scripts are not being executed when package is removed
with APK since they are not being included at all.

So, lets use APK-s support for post-deinstall scripts and ship our postrm
scripts if packages define them.

Fixes: d788ab376f85 ("build: add APK package build capabilities")
Link: https://github.com/openwrt/openwrt/pull/17023
Signed-off-by: Robert Marko <[email protected]>

include/package-pack.mk

@@ -110,6 +110,13 @@ endif
     IDIR_$(1):=$(PKG_BUILD_DIR)/ipkg-$(PKGARCH)/$(1)
     ADIR_$(1):=$(PKG_BUILD_DIR)/apk-$(PKGARCH)/$(1)
     KEEP_$(1):=$(strip $(call Package/$(1)/conffiles))
+    APK_SCRIPTS_$(1):=\
+    --script "post-install:$$(ADIR_$(1))/post-install" \
+    --script "pre-deinstall:$$(ADIR_$(1))/pre-deinstall"
+
+    ifdef Package/$(1)/postrm
+        APK_SCRIPTS_$(1)+=--script "post-deinstall:$$(ADIR_$(1))/postrm"
+    endif
 
     TARGET_VARIANT:=$$(if $(ALL_VARIANTS),$$(if $$(VARIANT),$$(filter-out *,$$(VARIANT)),$(firstword $(ALL_VARIANTS))))
     ifeq ($(BUILD_VARIANT),$$(if $$(TARGET_VARIANT),$$(TARGET_VARIANT),$(BUILD_VARIANT)))
@@ -360,8 +367,7 @@ else
 		), \
 		$$(prov) )" \
 	  $(if $(DEFAULT_VARIANT),--info "provider-priority:100",$(if $(PROVIDES),--info "provider-priority:1")) \
-	  --script "post-install:$$(ADIR_$(1))/post-install" \
-	  --script "pre-deinstall:$$(ADIR_$(1))/pre-deinstall" \
+	  $$(APK_SCRIPTS_$(1)) \
 	  --info "depends:$$(foreach depends,$$(subst $$(comma),$$(space),$$(subst $$(space),,$$(subst $$(paren_right),,$$(subst $$(paren_left),,$$(Package/$(1)/DEPENDS))))),$$(depends))" \
 	  --files "$$(IDIR_$(1))" \
 	  --output "$$(PACK_$(1))" \