[WIP][PATCH] Omit the ntvfs file server from default builds

[Jeremy Allison]

On Sat, Oct 10, 2015 at 10:13:43AM +1300, Andrew Bartlett wrote:
> This patch follows on from my proposal at SambaXP, to only build the
> ntvfs file server for developers, and if requested.

As you can tell, I'm really keep to end up getting rid
of the ntvfs file server - it'll make it a lot easier
to add new tests when I don't always have to remember
to disable them on the old fileserver.