[gnome-sdk-images] Don't attempt to remove configure for vala 0.40, it's not there.

[Michael Gratton <mjog src gnome org>]

commit a0780f3fa41c8d7c756d2834820683bb51b0bcb4
Author: Michael James Gratton <mike vee net>
Date:   Sat May 19 11:24:44 2018 +1000

    Don't attempt to remove configure for vala 0.40, it's not there.

 org.gnome.Sdk.json.in | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/org.gnome.Sdk.json.in b/org.gnome.Sdk.json.in
index 355ff40..b015806 100644
--- a/org.gnome.Sdk.json.in
+++ b/org.gnome.Sdk.json.in
@@ -186,7 +186,6 @@
             "name": "vala",
             "cleanup-platform": [ "*" ],
             "config-opts": [ "--enable-vapigen", "--enable-unversioned" ],
-            "rm-configure": true,
             "sources": [
                 {
                     "type": "git",