(Most) Jitter problems fixed

[Luca Saiu]

Hello.

I have quickly fixed most of the problems I knew of which were blocking
poke:

* fixed wrong prototypes for flockfile and funlockfile;
* fixed signed overflow in pointer distance (x86_64, riscv, m68k);
* temporarily disabled no-threading on riscv: the problem was the lack
  of support for far jumps (known bug, to be fixed on my side).

Thanks to Arsen Arsenović, Bruno Haible, José Marchesi, and other people
I may be forgetting.

The problem with malloc pointer alignment on Solaris has *not* been
fixed yet.

-- 
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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