[gupnp] build: Allow using gupnp as subproject

[Jens Georg <jensgeorg src gnome org>]

commit e35a8543e678d7ef1adfa68a93bb8ae3f02a3e99
Author: Jens Georg <mail jensge org>
Date:   Sat Jun 19 17:56:14 2021 +0200

    build: Allow using gupnp as subproject

 libgupnp/meson.build | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/libgupnp/meson.build b/libgupnp/meson.build
index 8a976c1..1f79b8a 100644
--- a/libgupnp/meson.build
+++ b/libgupnp/meson.build
@@ -116,6 +116,8 @@ gupnp = declare_dependency(
     dependencies : dependencies
 )
 
+meson.override_dependency('gupnp-1.2', gupnp)
+
 pkg.generate(
     libgupnp,
     subdirs: 'gupnp-1.2',