[dia] flatpak: Add python2 to build

[Zander <zbrown src gnome org>]

commit 878f2b99333a2e8e8b71afda276b2a32ae1addac
Author: Zander Brown <zbrown gnome org>
Date:   Wed Aug 28 14:07:18 2019 +0100

    flatpak: Add python2 to build

 .gitignore                           |  2 ++
 build-aux/flatpak/org.gnome.Dia.json | 10 ++++++++++
 2 files changed, 12 insertions(+)
---
diff --git a/.gitignore b/.gitignore
index a11208b3..bb34c7f7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,5 @@ build/
 build-release/
 .vscode
 *.pyc
+build-aux/flatpak/build/
+.flatpak-builder
diff --git a/build-aux/flatpak/org.gnome.Dia.json b/build-aux/flatpak/org.gnome.Dia.json
index 84251a69..54b5fada 100644
--- a/build-aux/flatpak/org.gnome.Dia.json
+++ b/build-aux/flatpak/org.gnome.Dia.json
@@ -145,6 +145,16 @@
                 }
             ]
         },
+        {
+            "name": "python2",
+            "sources": [
+                {
+                    "type": "archive",
+                    "url": "https://www.python.org/ftp/python/2.7.16/Python-2.7.16.tgz";,
+                    "md5": "f1a2ace631068444831d01485466ece0"
+                }
+            ]
+        },
         {
             "name": "pygtk",
             "sources": [{