Temporarily disabled no-threading on every architecture except m68k and x86_64

[Luca Saiu]

It turns out that the GNU poke friends are doing a good job with their compiler,
and how need to branch to far away destinations.  The displacement encoding in
hardware instructions is becoming a limit, and for the time being I have to
disable no-threading on every architecture not supporting wide displacements --
these are, among the currently supported architectures, only m68k and x86_64,
both allowing for 32-bit displacements.

The long-term solution is changing the Jitter code generation to (automatically)
use indirect jumps where needed.

New tag v0.9.283, updated Jitter submodule in poke for master and
maint/poke-2.

A pity, but this of course will be fixed.

-- 
Luca Saiu
* My personal web site:  http://ageinghacker.net
* GNU Jitter:            https://www.gnu.org/software/jitter
* GNU epsilon:           https://www.gnu.org/software/epsilon

I support everyone's freedom of mocking any opinion or belief, no
matter how deeply held, with open disrespect and the same unrelented
enthusiasm of a toddler who has just learned the word "poo".

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