Use buffer-name with recompile to reuse buffer

[favetelinguis]

When you have (setq justl-per-recipe-buffer t) and do a recompile a new buffer will open named *just* instead of reusing the buffer from where I am recompiling. The change fixes this issue.

This is the first time I make a contribution to emacs project so please tell me if im doing something wrong.

[psibi]

Thank you!