Revert "source/start: Quit on any condition, rid of CFFI signal handling."
Revert "source/start: Quit on any condition, rid of CFFI signal handling."

This reverts commit e33a7cd9fc8d7a4b6515fde4b4bc0884ae239030.

The reason is it was catching other conditions and exiting on initfile errors,
not only on SIGTERMs.

jmercouris/NeXT,jmercouris/NeXT