[hb-view] Use Chafa for terminal graphics if available

This produces high-quality terminal graphics using symbols or sixels
according to the detected terminal capabilities.

Fixes #2430.
diff --git a/util/meson.build b/util/meson.build
index 3c10d5d..5aa7585 100644
--- a/util/meson.build
+++ b/util/meson.build
@@ -31,7 +31,7 @@
     hb_view = executable('hb-view', hb_view_sources,
       cpp_args: cpp_args,
       include_directories: [incconfig, incsrc],
-      dependencies: util_deps,
+      dependencies: [util_deps, chafa_dep],
       link_with: [libharfbuzz],
       install: true,
     )