Compilation warnings under Emacs 29.2

[rdiez]

First of all, many thanks for dtrt-indent.

I just upgraded to Emacs 29.2 and dtrt-indent 1.16, and now I am getting these compilation warnings:

⛔ Warning (comp): dtrt-indent.el:198:44: Warning: reference to free variable ‘smie-grammar’
⛔ Warning (comp): dtrt-indent.el:200:25: Warning: reference to free variable ‘smie-config--buffer-local’
⛔ Warning (comp): dtrt-indent.el:201:19: Warning: reference to free variable ‘dtrt-indent-run-after-smie’
⛔ Warning (comp): dtrt-indent.el:207:31: Warning: defcustom for ‘dtrt-indent-global-mode’ fails to specify containing group
⛔ Warning (comp): dtrt-indent.el:207:2: Warning: docstring has wrong usage of unescaped single quotes (use \= or different quoting)
⛔ Warning (comp): dtrt-indent.el:437:2: Warning: custom-declare-variable `dtrt-indent-require-confirmation-flag' docstring has wrong usage of unescaped single quotes (use \= or different quoting)
⛔ Warning (comp): dtrt-indent.el:580:2: Warning: custom-declare-variable `dtrt-indent-min-matching-indentations' docstring has wrong usage of unescaped single quotes (use \= or different quoting)
⛔ Warning (comp): dtrt-indent.el:200:53: Warning: the function ‘smie-config-guess’ is not known to be defined.

[rrthomas]

Thanks for these. Patch welcome, otherwise I'll look at it some time.