[gupnp-av] doc: Let meson do the build/src thing

[Jens Georg <jensgeorg src gnome org>]

commit bc6fa77d05e8976daff0c8199cc350017b6e8b4b
Author: Jens Georg <mail jensge org>
Date:   Tue Oct 6 11:24:21 2020 +0200

    doc: Let meson do the build/src thing

 doc/meson.build | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)
---
diff --git a/doc/meson.build b/doc/meson.build
index 50942f3..2c7ca64 100644
--- a/doc/meson.build
+++ b/doc/meson.build
@@ -9,10 +9,7 @@ version_xml = configure_file(
 
 gnome.gtkdoc(
     'gupnp-av',
-    src_dir : [
-        join_paths(meson.source_root(), 'libgupnp-av'),
-        join_paths(meson.build_root(), 'libgupnp-av'),
-    ],
+    src_dir : ['libgupnp-av'],
     main_sgml : 'gupnp-av-docs.sgml',
     content_files : version_xml,
     scan_args : ['--deprecated-guards=GUPNP_DISABLE_DEPRECATED'],