g_mapped_file_unref() was introduced in GLib 2.22, but we depend only on GLib 2.18, so use g_mapped_file_free() when compiling against older GLib versions until we bump the GLib dependency.
g_mapped_file_unref() was introduced in GLib 2.22, but we depend only on GLib 2.18, so use g_mapped_file_free() when compiling against older GLib versions until we bump the GLib dependency.