More tweaks to eglibc 2.13

Still cannot get a full build with eglibc 2.13.  Xenclient-nws continues to fail
unless the GHC libs are rebuild (message that pthread cannot be found.
Compile and linker tweaks
Changes to GHC recipe

xenclient-nws is having issues around some GHC stuff.  Thinking some of my
earlier changes towards autotools could have caused it.
Added missing deps to ocaml

Ocaml-cross was missing dependencies that pop up when building images out
of order.  It assumed dependencies happened to already be built.
virtclass deprecated

Changed virtclass to just class.