patch for smartmontools on latest head

[Samorukov,Alexey]

> 
> http://dpaste.com/1B04AVB
> 
> I believe that this patch should do the right thing on all version of FreeBSD,
> so it could be better to integrate it upstream, if possible.
> 
> Without the patch the port fails with errors like:
> ./freebsd_nvme_ioctl.h:34:8: error: redefinition of 'nvme_command'


Thank you! I already found report in the list but had no time to look on it. 

I will check it and commit to the source.