[gtk/backport-font-feature-pango-hb] Meson: Enable font features demo on later Pango versions

[Chun-wei Fan <fanchunwei src gnome org>]

commit 4f7b830432e5887caf7a93c6020701236a2af994
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Thu Nov 25 18:56:24 2021 +0800

    Meson: Enable font features demo on later Pango versions
    
    ...even if PangoFT2 is not present, provided that Pango 1.44.0+ and
    HarfBuzz 2.2.0+ are installed.  The demo now has added support for later
    Pango versions that use HarfBuzz for shaping on all supported platforms.

 demos/gtk-demo/meson.build | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)
---
diff --git a/demos/gtk-demo/meson.build b/demos/gtk-demo/meson.build
index 82e08973a5..ac54be6c72 100644
--- a/demos/gtk-demo/meson.build
+++ b/demos/gtk-demo/meson.build
@@ -76,7 +76,17 @@ demos = files([
 
 gtkdemo_deps = [libgtk_dep]
 
-if harfbuzz_dep.found() and pangoft_dep.found()
+if pango_dep.version().version_compare('>=1.44.0')
+  if harfbuzz_dep.found()
+    if cc.has_header_symbol(
+      'hb-ot.h',
+      'hb_ot_var_get_axis_count',
+      dependencies: harfbuzz_dep
+    )
+      demos += files('font_features.c')
+    endif
+  endif
+elif harfbuzz_dep.found() and pangoft_dep.found()
   demos += files('font_features.c')
   gtkdemo_deps += [harfbuzz_dep, pangoft_dep]
 endif