Compilation of src/xsettings.c fails when configured with --without_gsettings

[wilde]

Hi *,

When HAVE_GSETTINGS is not defined (e.g. --without-gsettings
configuration option), but HAVE_PGTK is defined, then compilation of
src/xsettings.c fails with:

../../src/xsettings.c: In function ‘xsettings_get_font_options’:
../../src/xsettings.c:1163:35: error: ‘font_options’ undeclared (first use in 
this function)
 1163 |   return cairo_font_options_copy (font_options);
      |                                   ^~~~~~~~~~~~
../../src/xsettings.c:1163:35: note: each undeclared identifier is reported 
only once for each function it appears in
../../src/xsettings.c: In function ‘syms_of_xsettings’:
../../src/xsettings.c:1220:3: error: ‘font_options’ undeclared (first use in 
this function)
 1220 |   font_options = NULL;
      |   ^~~~~~~~~~~~

This happens due to the fact that: `font_options' is declared in L.231 which is 
guarded by
#ifdef HAVE_GSETTINGS
in L.209.

This was problem was most likely introduced with:

commit 526e9758de7d163ce3b25fde69a4e122ce9c3742
Author: Pieter van Prooijen <pieter.van.prooijen@teloden.nl>
Date:   Sun May 8 16:27:38 2022 +0200

    Use gsettings font rendering entries for pgtk builds

cheers,
sascha