libreadline: set ABI_VERSION to force rebuild of dependent packages

Signed-off-by: Felix Fietkau <[email protected]>

package/libs/libreadline/Makefile

@@ -29,6 +29,7 @@ define Package/libreadline
   CATEGORY:=Libraries
   TITLE:=Command lines edition library
   URL:=http://cnswww.cns.cwru.edu/php/chet/readline/rltop.html
+  ABI_VERSION:=$(PKG_VERSION)
 endef
 
 define Package/libreadline/description