Merge pull request #11142 from cresh/darwin-sshpass

sshpass: Enable on OS X.

pkgs/tools/networking/sshpass/default.nix

···
     homepage = http://sourceforge.net/projects/sshpass/;
     description = "Non-interactive ssh password auth";
     maintainers = [ stdenv.lib.maintainers.madjar ];
-    platforms = stdenv.lib.platforms.linux;
+    platforms = stdenv.lib.platforms.unix;
   };
 }