cla-sysrepo needs libev

On legacy sysrepo, this has been masked via a transitive dependency there.
Well, not anymore :).

Change-Id: I7b400122aeef27a5c7976edaad7978c0b3b6ccae
diff --git a/package/cla-sysrepo/Config.in b/package/cla-sysrepo/Config.in
index 873a9aa..c1c7723 100644
--- a/package/cla-sysrepo/Config.in
+++ b/package/cla-sysrepo/Config.in
@@ -9,5 +9,6 @@
 	select BR2_PACKAGE_LIBGPIOD
 	select BR2_PACKAGE_BOOST
 	select BR2_PACKAGE_CPPCODEC
+	select BR2_PACKAGE_LIBEV
 	help
 	  Control CzechLight devices over YANG with sysrepo