Pulling out XenStore out of Mirage.

[Vincent Bernardoff <vb@xxxxxxxxxxxxxx>]

Please try out my branch no-xenstore of mirage-platform 
(git://github.com/vbmithr/mirage-platform), compatible with my branch 
"mirage-compatible" of git://github.com/vbmithr/ocaml-xenstore.
It should work, and thus make it much easier to develop libraries that 
depends on either mirage-platform or Unix's xenctrl library. In 
particular, this is a requirement for an easy cross unix/xen packaging 
of my ocaml-xenstore library.
I'm going to test it as well ASAP, but I wouldn't mind other people 
trying it out too.
Cheers,

Vincent