[gnome-continuous] Update Mesa's config-opts

[Emmanuele Bassi <ebassi src gnome org>]

commit 0a3d7139a78684711b6da94402f049d6c9a73bdc
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Sep 3 00:35:18 2019 +0100

    Update Mesa's config-opts
    
    Only one swrast provider can be built.

 manifest.json | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/manifest.json b/manifest.json
index 52f690f..0d154a9 100644
--- a/manifest.json
+++ b/manifest.json
@@ -335,9 +335,9 @@
                      "-Dgbm=true",
                      "-Dgallium-xa=true",
                      "-Dllvm=true",
-                     "-Dgallium-drivers=svga,r300,nouveau,swrast,virgl",
+                     "-Dgallium-drivers=svga,r300,swrast,virgl",
                      "-Dvulkan-drivers=intel",
-                     "-Ddri-drivers=r200,i915,i965,swrast"]},
+                     "-Ddri-drivers=r200,i915,i965"]},
 
 
                 {"src": "git:https://gitlab.freedesktop.org/mesa/glu.git";,