[gnome-build-meta] Disable RDP support in gnome-boxes

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 53f840ccb8e98f94375fe7d0e489ef47c782dc6f
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Wed May 16 13:09:13 2018 -0500

    Disable RDP support in gnome-boxes
    
    We do not have FreeRDP, and I'm not going to try adding it now.

 elements/core/gnome-boxes.bst | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/elements/core/gnome-boxes.bst b/elements/core/gnome-boxes.bst
index a12ced7..23c32e1 100644
--- a/elements/core/gnome-boxes.bst
+++ b/elements/core/gnome-boxes.bst
@@ -21,3 +21,5 @@ depends:
 - core/adwaita-icon-theme.bst
 - filename: base.bst
   junction: freedesktop-sdk.bst
+variables:
+  meson-local: -Drdp=false