[gnome-builder] autotools: prefer autotools over cargo by default

[Christian Hergert <chergert src gnome org>]

commit 0cdfe8a9f1078395ef6af8eda9c64f16d74dac7c
Author: Christian Hergert <chergert redhat com>
Date:   Sun Jan 13 16:44:32 2019 -0800

    autotools: prefer autotools over cargo by default

 src/plugins/autotools/gbp-autotools-build-system-discovery.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/plugins/autotools/gbp-autotools-build-system-discovery.c 
b/src/plugins/autotools/gbp-autotools-build-system-discovery.c
index 31239425f..a38637171 100644
--- a/src/plugins/autotools/gbp-autotools-build-system-discovery.c
+++ b/src/plugins/autotools/gbp-autotools-build-system-discovery.c
@@ -44,6 +44,6 @@ gbp_autotools_build_system_discovery_init (GbpAutotoolsBuildSystemDiscovery *sel
   g_object_set (self,
                 "glob", "configure.ac",
                 "hint", "autotools",
-                "priority", 0,
+                "priority", -300,
                 NULL);
 }