libubox: set abi version to previous bump for stable release

In order to keep a coherent set of dependencies of the packages in the
target specific packages (nonshared) in the stable 25.12.0 release
repositories and keep ImageBuilders and ASU functional, hard code the
abi-version used in that builbot phase1 run: "20260213".
*abi compatibility has not changed between 20260213 and 20260313 anyway.

Signed-off-by: Mario Andrés Pérez <mapb_@outlook.com>

Author: map-b

package/libs/libubox/Makefile

@@ -1,14 +1,15 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libubox
-PKG_RELEASE=1
+PKG_RELEASE=2
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(PROJECT_GIT)/project/libubox.git
 PKG_MIRROR_HASH:=55b2298ea74bb4c7267e4b615d442aeff601e0de88ec0e641e4c40eed8454e85
 PKG_SOURCE_DATE:=2026-03-13
 PKG_SOURCE_VERSION:=815633847cd32ffe6da28943cbeb37edc88265c8
-PKG_ABI_VERSION:=$(call abi_version_str,$(PKG_SOURCE_DATE))
+# PKG_ABI_VERSION:=$(call abi_version_str,$(PKG_SOURCE_DATE))
+PKG_ABI_VERSION:=20260213
 CMAKE_INSTALL:=1
 
 PKG_LICENSE:=ISC