bug#9963: ./temacs -Q -nw abort in bidi_initialize

[Eli Zaretskii <eliz@gnu.org>]

> Date: Sun, 06 Nov 2011 02:24:43 -0500
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 9963@debbugs.gnu.org
> 
> > > This abort means you somehow have a problem loading uni-bidi.el, or
> > > didn't load it at all, or perhaps load a wrong uni-bidi.el (e.g., from
> > > Emacs 23).  It is strange that it works without -nw, though.
> > 
> > It looks this happens when printing the first "Loading" message at
> > startup to load loadup.el.
> 
> That figures: Emacs needs uni-bidi for display, and `message' enters
> redisplay.
> 
> >  Is uni-bidi.el loaded before that?
> 
> Evidently, it isn't.  I think it is pulled in when charprop is loaded,
> but that's half-way down loadup.el.
> 
> We need to find a way of loading uni-bidi and uni-mirrored before
> loading loadup.el.  I will get to that later today, if no one beats me
> to it.

I think I fixed this (revision 106305 on the trunk), please check.

For the record: I decided that loading uni-bidi in advance is not a
good idea, as proper functioning of character property tables needed
by bidi.c depends on many other *.el files that are normally loaded
before uni-bidi.  There be dragons there.  So instead, I disabled bidi
reordering for as long as purify-flag is non-nil; I hope this is TRT
for all supported configurations, including CANNOT_DUMP.