New Jitter tag v0.9.294; update jitter submodule in poke

[Luca Saiu]

This only enables no-threading on non-solaris x86_64 configurations.  I
will do better later when I have time for debugging.

-- 
Luca Saiu
* My personal web site:  https://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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