[gnome-calculator] flatpak: build sourceview with meson

[Robert Roth <robertroth src gnome org>]

commit 5a88098184ac7a07b9fd442e1f12b43a1c85cbcc
Author: Jordan Petridis <jpetridis gnome org>
Date:   Sun Jun 30 22:25:56 2019 +0300

    flatpak: build sourceview with meson

 org.gnome.Calculator.json | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/org.gnome.Calculator.json b/org.gnome.Calculator.json
index 7ffbafd7..106fd5d0 100644
--- a/org.gnome.Calculator.json
+++ b/org.gnome.Calculator.json
@@ -68,6 +68,7 @@
         },
         {
             "name" : "gtksourceview",
+            "buildsystem": "meson",
             "sources" : [
                 {
                     "type" : "git",