[pitivi/1.0] build: Fix gst-plugins-base build

[Alexandru Băluț <alexbalut src gnome org>]

commit 67ce2954d97e9bcd3d6526532740db36b7bd9b6b
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Tue May 14 21:51:01 2019 +0200

    build: Fix gst-plugins-base build

 build/flatpak/org.pitivi.Pitivi.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/build/flatpak/org.pitivi.Pitivi.json b/build/flatpak/org.pitivi.Pitivi.json
index a007b077..b29d72f9 100644
--- a/build/flatpak/org.pitivi.Pitivi.json
+++ b/build/flatpak/org.pitivi.Pitivi.json
@@ -460,7 +460,8 @@
             "config-opts": [
                 "-Dgtk_doc=disabled",
                 "-Dorc=enabled",
-                "--libdir=lib"
+                "--libdir=lib",
+                "--wrap-mode=nodownload"
             ],
             "builddir": true,
             "sources": [