Fix the userspace link

On newer systems (eg Ubuntu trusty) an OASIS Executable which includes
C code and CClib: -lsomelibrary fails to link.

The workaround is to make an intermediate internal library containing the
stubs and link that.

Signed-off-by: David Scott <dave.scott@citrix.com>
Merge pull request #1 from djs55/fix-link

Fix the userspace link
Merge github.com:mirage/ocaml-xenstore-server

Signed-off-by: David Scott <dave.scott@citrix.com>

Conflicts:
	_oasis
	_tags
	core/META
	myocamlbuild.ml
	setup.ml