[gtk/ebassi/issue-3864] gsk/ngl: Build with G_DISABLE_ASSERT enabled

[Emmanuele Bassi <ebassi src gnome org>]

commit 6d3beaf9555f8d6d9e35ece290c8196d04cbbd2d
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Apr 12 12:27:55 2021 +0100

    gsk/ngl: Build with G_DISABLE_ASSERT enabled

 gsk/ngl/gskngltexturelibrary.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gsk/ngl/gskngltexturelibrary.c b/gsk/ngl/gskngltexturelibrary.c
index 2de6e492c5..1e87fc6a6a 100644
--- a/gsk/ngl/gskngltexturelibrary.c
+++ b/gsk/ngl/gskngltexturelibrary.c
@@ -246,7 +246,7 @@ gsk_ngl_texture_atlas_initialize (GskNglDriver       *driver,
 {
   /* Insert a single pixel at 0,0 for use in coloring */
 
-  gboolean packed;
+  gboolean packed G_GNUC_UNUSED;
   int x, y;
   guint gl_format;
   guint gl_type;