[gnome-sdk-images] Try to get mozjs52 to build

[Matthias Clasen <matthiasc src gnome org>]

commit e64faa3bbf7b179970452617b67a5014a51e592a
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Jul 20 19:09:08 2017 -0400

    Try to get mozjs52 to build

 org.gnome.Sdk.json.in |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/org.gnome.Sdk.json.in b/org.gnome.Sdk.json.in
index f7deced..bc5226e 100644
--- a/org.gnome.Sdk.json.in
+++ b/org.gnome.Sdk.json.in
@@ -625,7 +625,6 @@
             },
             "config-opts": [  "--enable-posix-nspr-emulation",
                               "--with-system-zlib",
-                              "--enable-system-ffi",
                               "--with-system-icu",
                               "--with-intl-api"],
             "subdir": "js/src",