uclient: set fixed ABI_VERSION on libuclient

Last incompatible change appeared to be 4924411
("http: add proper error handling to uclient_http_redirect()") which
changed the return value of uclient_http_redirect() from bool to int.

Signed-off-by: Jo-Philipp Wich <[email protected]>

package/libs/uclient/Makefile

@@ -24,7 +24,7 @@ define Package/libuclient
   SECTION:=libs
   CATEGORY:=Libraries
   TITLE:=HTTP/1.1 client library
-  ABI_VERSION:=$(PKG_VERSION)
+  ABI_VERSION:=20160123
   DEPENDS:=+libubox
 endef