sig_action.h: Define _NSIG_WORDS if necessary _NSIG_WORDS is defined in <asm/signal.h> on Linux, which I assume was previously included by dietlibc's <signal.h> but no longer is.
Including <asm/signal.h> here might introduce conflicts, so just define _NSIG_WORDS here if we're going to use it and it's not already defined.
ngetty-helper: Relax permissions check on Conf ngetty-helper ignores the contents of the configuration file if any permissions outside 0600 (owner read and writable) are set. But debhelper sets the permissions to 0644, so it is ignored by default.
There is nothing secret in the configuration file, so the only dangerous permission bits are the group and world writable bits.
