build: Build less of Samba when building --without-ntvfs-fileserver

build: Build less of Samba when building --without-ntvfs-fileserver

We would build, but not use, many components of the NTVFS file server
even when we asked not to.  They would then consume disk, but not be
of any use

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>