Do not set handler for SIGINT and SIGQUIT to SIG_IGN since it prevents

getpass()/readpassphrase() from being able to restore the tty mode
on keyboard interrupt.  Along with the recent readpassphrase.c commit
this means that if you ^C things that use login scripts (like su(1))
with a non-CBREAK shell your tty mode will be restored nicely.

TODO:
The various login scripts need to install handlers to avoid leaving
turd files or otherwise ending in a bad state.  It would also be
nice to send BI_REJECT to the back channel.

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