- added missing bx_atexit() call before quit_sim() (runtime option "quit" now   has the same behaviour as the power button)
- added missing bx_atexit() call before quit_sim() (runtime option "quit" now
  has the same behaviour as the power button)

marmolejo/bochs-zet,marmolejo/bochs-zet,marmolejo/bochs-zet,marmolejo/bochs-zet,marmolejo/bochs-zet