[gnome-continuous] Update Mesa config-opts

[Emmanuele Bassi <ebassi src gnome org>]

commit 72b33b2663c8522fd42fa379b0485677f176a3ed
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Sep 3 00:26:53 2019 +0100

    Update Mesa config-opts
    
    Drop unknown arguments.

 manifest.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/manifest.json b/manifest.json
index b5c811a..52f690f 100644
--- a/manifest.json
+++ b/manifest.json
@@ -337,7 +337,7 @@
                      "-Dllvm=true",
                      "-Dgallium-drivers=svga,r300,nouveau,swrast,virgl",
                      "-Dvulkan-drivers=intel",
-                     "-Ddri-drivers=nouveau,radeon,r200,i915,i965,swrast"]},
+                     "-Ddri-drivers=r200,i915,i965,swrast"]},
 
 
                 {"src": "git:https://gitlab.freedesktop.org/mesa/glu.git";,