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

[Luca Saiu]

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,

-- 
Luca Saiu
* My personal web site:  http://ageinghacker.net
* Jitter:                http://ageinghacker.net/projects/jitter
* GNU epsilon:           http://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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