PATCH: make disabling of vfs_snapper consistent with our configure/build system

[Björn JACKE]

Hi David,
On 2020-09-02 at 12:36 +0200 David Disseldorp sent off:
> > I mentioned before that I object that we introduce more enabled-by-default
> > options, which need to be explicitly disabled on all other non-Linux platforms.
> > See by mail from August 12 for more details on this.
> 
> Please see the gitlab patch discussion. The new patch disables the
> module by default on non-Linux platforms.

thanks, that looks fine to me to solve this for 4.13. I also just tested that
patch also with 4.13 on AIX.

RB+ from me :-)

Björn