libubox: use PKG_ABI_VERSION

Signed-off-by: Felix Fietkau <nbd@nbd.name>

package/libs/libubox/Makefile

@@ -8,6 +8,7 @@ PKG_SOURCE_URL=$(PROJECT_GIT)/project/libubox.git
 PKG_MIRROR_HASH:=97dc4eba01cf2c5d6a6d0db3747e0cdc0d95cb87e51b3115272e7d3e69a8b255
 PKG_SOURCE_DATE:=2020-12-12
 PKG_SOURCE_VERSION:=357877693ca363b12e6e7e14d345639b2440cd07
+PKG_ABI_VERSION:=$(call abi_version_str,$(PKG_SOURCE_DATE))
 CMAKE_INSTALL:=1
 
 PKG_LICENSE:=ISC
@@ -27,7 +28,7 @@ define Package/libubox
   SECTION:=libs
   CATEGORY:=Libraries
   TITLE:=Basic utility library
-  ABI_VERSION:=20201212
+  ABI_VERSION:=$(PKG_ABI_VERSION)
   DEPENDS:=
 endef
 
@@ -35,6 +36,7 @@ define Package/libblobmsg-json
   SECTION:=libs
   CATEGORY:=Libraries
   TITLE:=blobmsg <-> json conversion library
+  ABI_VERSION:=$(PKG_ABI_VERSION)
   DEPENDS:=+libjson-c +libubox
 endef
 
@@ -53,6 +55,7 @@ define Package/libjson-script
   SECTION:=utils
   CATEGORY:=Utilities
   DEPENDS:=+libubox
+  ABI_VERSION:=$(PKG_ABI_VERSION)
   TITLE:=Minimalistic JSON based scripting engine
 endef