[gnome-sdk-images] gcab switched to meson

[Alexander Larsson <alexl src gnome org>]

commit 7b47ebb4d8aa1ccb504570b90eda73882065bfe7
Author: Alexander Larsson <alexl redhat com>
Date:   Mon Feb 5 10:08:59 2018 +0100

    gcab switched to meson

 org.gnome.Sdk.json.in |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/org.gnome.Sdk.json.in b/org.gnome.Sdk.json.in
index 5b5cc2d..500c1c3 100644
--- a/org.gnome.Sdk.json.in
+++ b/org.gnome.Sdk.json.in
@@ -609,8 +609,7 @@
         },
         {
             "name": "gcab",
-            "config-opts": ["--disable-static", "--enable-fast-install"],
-            "no-parallel-make": true,
+            "buildsystem": "meson",
             "sources": [
                 {
                     "type": "git",