New Jitter tag v0.9.307 with build system fixes for readline and textstyle

[Luca Saiu]

Updated poke's jitter submodule.

All nice, except that I have also rebased Jitter's master branch.  The
poke people should not see the ugliness, but others might.  Sorry for
that.

commit 6cac5bd2ed230d7e54c05c1ea67f0b86a448b0ec (tag: v0.9.307, 
origin/fixes-for-poke-to-rebase--2024-03, fixes-for-poke-to-rebase--2024-03)
Author: Luca Saiu <positron@gnu.org>
Date:   Sun Mar 10 16:08:46 2024 +0100

    configure: use Gnulib macros to check for GNU Readline and GNU libtextstyle
    
    My previous complicated logic detected library dependencies of other 
libraries,
    by attempts.  It worked, except (thanks to Bruno Haible for reporting) on 
some
    platform where one dependency conflicted with some other (ncurses and 
termcap),
    even if both were required on at least some of my tested GNU/Linux
    configurations.
    
    Now I am letting Gnulib do the job of detecting libraries along with their
    dependencies.  I am keeping my own logic for using them.
    
    * bootstrap.conf (gnulib_modules): Add Readline and libtextstyle.
    * configure.ac (jitter_have_readline, jitter_have_libtextstyle): Redefine.
    
    Suggested by Bruno Haible and Mohammad-Reza Nabipoor.

-- 
Luca Saiu      https://ageinghacker.net
  GNU Jitter     https://www.gnu.org/software/jitter
  GNU epsilon    https://www.gnu.org/software/epsilon
  pEp-mail-tool  https://codeberg.org/pEp/pEp-mail-tool

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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