Re: poke 1.x: omit -I /usr/include from bin/jitter --cppflags

[Jose E. Marchesi]

> There should be no user-visible changes for native configurations.
>
> I am not cherry-picking the fix I prepared for Romain to the
> jitter-for-poke-1.x branch; the idea is not adding
>   -I /usr/include
> or similar as part of JITTER_CPPFLAGS, when cross-compiling.  This may
> or may not be exactly what Romain needs, but appears to be the right
> thing and, importantly, makes jitter-for-poke-1.x compatible with master
> in this respect.
>
> Updated jitter submodule in poke maint/poke-1.  New jitter tag
> v0.9.263.2.
>
> Regards,

Thanks Luca.