[glib/wip/xclaesse/meson-gio-var-take2] meson: Add schemasdir and giomoduledir to gio dependency

[Philip Withnall <pwithnall src gnome org>]

commit 218ac195df66bcf5de0716069cd37eb5843ad502
Author: Xavier Claessens <xavier claessens collabora com>
Date:   Mon Feb 21 13:03:15 2022 -0500

    meson: Add schemasdir and giomoduledir to gio dependency
    
    This allows applications to get their value regardless whether glib is a
    subproject or pkgconfig:
    
      gio_dep = dependency('gio-2.0')
      giomoduledir = gio_dep.get_variable('giomoduledir')
      schemasdir = gio_dep.get_variable('schemasdir')

 gio/meson.build | 10 ++++++++++
 1 file changed, 10 insertions(+)
---
diff --git a/gio/meson.build b/gio/meson.build
index 139a48c86..874de4b15 100644
--- a/gio/meson.build
+++ b/gio/meson.build
@@ -823,6 +823,16 @@ libgio_dep = declare_dependency(link_with : libgio,
   dependencies : [libgmodule_dep, libgobject_dep, gioenumtypes_dep],
   include_directories : [gioinc])
 
+# Work around variables kwarg requiring Meson 0.56
+if meson.version().version_compare('>=0.56.0')
+  libgio_dep = declare_dependency(dependencies: libgio_dep,
+    variables: [
+      'schemasdir=' + join_paths(glib_datadir, schemas_subdir),
+      'giomoduledir=' + glib_giomodulesdir,
+    ]
+  )
+endif
+
 pkg.generate(libgio,
   requires : ['glib-2.0', 'gobject-2.0'],
   variables : ['datadir=' + join_paths('${prefix}', get_option('datadir')),