If the name of the jail we want is already being used,
pick a new name, and make the 'j' symlink point to that new name.
net/samba41 and www/aria2 are compiled with gcc47.

To save space, we deinstall gcc47 from the staging area used to make the final image.
However, we cannot delete all of gcc47.  We need to keep around shared libraries from
gcc47 because code compiled with this compiler needs those libraries.

So, just before deinstalling gcc47, save away the shared libraries from lang/gcc47.
Then after deinstalling gcc47, restore the shared libraries from lang/gcc47.

Ticket: #4348