Re: fix for #493333 and other things

[Chris Lumens <clumens redhat com>]

> I've tested the _isys.so fix here using the F-11 Beta LiveCD and it's
> working.  /etc/mtab gets poked at correctly or whatever needs to happen
> in magical filesystem mounting land.
> 
> Other things:
> 
> 1) Preserve symlinks when tossing things in initrd.img
> 2) Fix one issue in the updates target

This is a kind of scary set of changes (imount.c AND mk-images in the
same set?  are you crazy?) but I guess it's fine.  At least we'll know
pretty soon if there's something wrong with them.

- Chris