Add osx installer and package to the SF downloads

[Alex Samorukov]

There are number of ways to get recent smartmontools on the OSX. However all of them will require to install many additional tools (xcode, etc.) and result may vary. It should be find to have kind of "reference" build available from the sourceforge download. As far as i could see [1] it should be possible to do such cross-build from the Linux env, however i did not tried yet myself.

Correct resolution of the tickets should include:

1. Setup and build smartmontools under osxcross, check if autoconf may handle this
2. Find if it is possible to generate pkg and dmg on Linux [2] ?
3. Find if it is possible to run smartd as a daemon with desktop notifications
4. If everything works - add result to the SF downloads :)

[1] ​https://github.com/tpoechtrager/osxcross
[2] ​http://vincent.bernat.im/en/blog/2013-autoconf-osx-packaging.html