[gnome-builder] meson-templates: set builddir:true for module

[Christian Hergert <chergert src gnome org>]

commit 28c3497caecf010ab2fb7e861f7c76310ea7aacf
Author: Christian Hergert <chergert redhat com>
Date:   Thu Mar 14 13:53:35 2019 -0700

    meson-templates: set builddir:true for module
    
    This ensures that we can have different build vs source dirs
    for the project.

 src/plugins/meson-templates/resources/flatpak.json | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/plugins/meson-templates/resources/flatpak.json 
b/src/plugins/meson-templates/resources/flatpak.json
index 6edfe5a17..357c67b45 100644
--- a/src/plugins/meson-templates/resources/flatpak.json
+++ b/src/plugins/meson-templates/resources/flatpak.json
@@ -120,6 +120,7 @@
 {{end}}
         {
             "name": "{{name}}",
+            "builddir": true,
             "buildsystem": "meson",
             "sources": [
                 {