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Lethal option-related bug

I just submitted a batch job for the first time with an unpatched
3.0-pre4 and it dumped core straight away.  (I think the shell is
still yelling out `Don't release me!  Don't release me!'.)

It turns out to be easy to reproduce:

./zsh -s
zsh: 7863 segmentation fault (core dumped)  ./zsh -s

The backtrace is

#0  0x47d9b4 in inittyptab () at utils.c:2510
#1  0x47fed4 in dosetopt (optno=92, value=1, force=268534416) at utils.c:3330
#2  0x447094 in parseargs (argv=0x7fffaf48) at init.c:242
#3  0x4463f0 in main (argc=0, argv=0x7fffaf44) at init.c:60

and the problem is that ifs is null in inittyptab; possibly not too
surprising, since it gets initialised in setupvals(), which is called
a few lines after parseargs() in main().  It looks like SHINSTDIN
wants inittytab set up before the shell's set up enough for it.

I could probably hack round this, but I'm not confident of producing
the right fix, so I'll leave it.

Peter Stephenson <pws@xxxxxx>       Tel: +49 33762 77366
WWW:  http://www.ifh.de/~pws/       Fax: +49 33762 77330
Deutches Electronen-Synchrotron --- Institut fuer Hochenergiephysik Zeuthen
DESY-IfH, 15735 Zeuthen, Germany.

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