bug#59460: 29.0.50; Build failure because of bashism in configure.ac (tree-sitter)

[Eli Zaretskii]

> From: Sam James <sam@gentoo.org>
> Date: Mon, 21 Nov 2022 21:58:45 +0000
> 
> Emacs fails to build from master at commit `` with the following error:
> ```
> checking for tree-sitter >= 0.20.2... no
> checking for tree-sitter >= 0.6.3... yes
> checking for ts_set_allocator... yes
> ./configure: 16142: test: yes: unexpected operator
> configure: error: Tree-sitter library exists but its version is too old
> 
> !!! Please attach the following file when seeking support:
> !!! /var/tmp/portage/app-editors/emacs-29.0.9999/work/emacs/config.log
>  * ERROR: app-editors/emacs-29.0.9999::gentoo failed (configure phase):
>   *   econf failed
> ```
> 
> My /bin/sh is dash (POSIX compliant, not bash).
> 
> I've attached the logs for completeness, but the '==' in the
> configure.ac test should become '='.

Thanks, I installed the patch.