[buglet] Ctrl+C and 'kill -s INT $$' should produce exit status 130

[Martijn Dekker <martijn@xxxxxxxx>]

On an interactive shell, sending SIGINT to the shell (which could be
done with 'kill -s INT $$' or simply by pressing Ctrl+C) causes zsh to
return to the command prompt with an exit status of 0, which represents
a normal/successful exit. This should be 130, the exit status
corresponding to SIGINT (128+2).

% while :; do :; done
^C%
% echo $?                     # should produce 130
0
% kill -s INT $$; echo oops   # no output produced, as expected
% echo $?                     # should produce 130
0