[gupnp-dlna] Add missing meson.build

[Jens Georg <jensgeorg src gnome org>]

commit 3f7be51e7d25cdd298414753c7c00b2b7d69b136
Author: Jens Georg <jensg openismus com>
Date:   Tue Jun 22 11:22:13 2021 +0200

    Add missing meson.build

 internal/meson.build | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/internal/meson.build b/internal/meson.build
new file mode 100644
index 0000000..accff3c
--- /dev/null
+++ b/internal/meson.build
@@ -0,0 +1,3 @@
+config_h = configure_file(output : 'config.h', configuration : config)
+config_h_inc = include_directories('.')
+