[gnome-sdk-images] at-spi2-core has switched to meson

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 405468650e077619ed5288bba996ddb3530ada8e
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Fri Dec 8 17:28:15 2017 -0600

    at-spi2-core has switched to meson
    
    ...over a month ago...?

 org.gnome.Sdk.json.in |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/org.gnome.Sdk.json.in b/org.gnome.Sdk.json.in
index aea4ef2..70426ab 100644
--- a/org.gnome.Sdk.json.in
+++ b/org.gnome.Sdk.json.in
@@ -310,6 +310,7 @@
         },
         {
             "name": "at-spi2-core",
+            "buildsystem": "meson",
             "sources": [
                 {
                     "type": "git",