Bug#783293: browsers crash with 'illegal instruction' on i586

[Bernhard Übelacker]

Hello hikaru,
tried to have a look at the browser crashes.

Unfortunately there it seems some part of the webkit engine does 
generate code 'just in time'. But this generator uses instructions like 
'fucomip', which is only available on later than pentium.

I tried as a workaround to build a libqtwebkit package with attached 
little modification (does disable JIT, like for other archs).
With this the browser does not crash.

Again unfortunately this packages have not distinct files for i586 and 
i686 like e.g. libav.
Therefore would such a change affect every x86 user of this package.
So this is also just a workaround.

(I have not tested it, but I would expect this is the
same case for libjavascriptcoregtk-3.0-0.)

Kind regards,
Bernhard
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