Remove usage-requirements as they are not necessary,

and can cause bogus dependencies for serialization's client.


[SVN r43722]

libs/serialization

@@ -1 +1 @@
-Subproject commit 42b0c2ad3e993b878ca421ae679aceccf0a28962
+Subproject commit cca24b471e48f95b96fe1d23a801fb5d5cf6db6c