[gnome-builder] build: fix some meson warnings

[Christian Hergert <chergert src gnome org>]

commit 7d7fc5357b0b55819c708fdc888700616d95f176
Author: Christian Hergert <chergert redhat com>
Date:   Wed Aug 8 19:17:53 2018 -0700

    build: fix some meson warnings
    
    Now that we can rely on Sdk//master, we can bump this.

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 1c03a017d..b5163673b 100644
--- a/meson.build
+++ b/meson.build
@@ -1,7 +1,7 @@
 project('gnome-builder', 'c',
           license: 'GPL3+',
           version: '3.29.4',
-    meson_version: '>= 0.46.0',
+    meson_version: '>= 0.47.1',
   default_options: [ 'c_std=gnu11',
                      'cpp_std=c++11',
                      'warning_level=2',