[gnome-boxes] flatpak: Add libarchive

[Felipe Borges <felipeborges src gnome org>]

commit 68503a1dc8559acffd7db8c1b32e647d80a86acc
Author: Fabiano Fidêncio <fidencio redhat com>
Date:   Wed Feb 13 15:11:57 2019 +0100

    flatpak: Add libarchive
    
    Without building libarchive by our own, we may find some non-supported
    compression types (as lzma).
    
    Signed-off-by: Fabiano Fidêncio <fidencio redhat com>

 build-aux/flatpak/org.gnome.Boxes.json | 10 ++++++++++
 1 file changed, 10 insertions(+)
---
diff --git a/build-aux/flatpak/org.gnome.Boxes.json b/build-aux/flatpak/org.gnome.Boxes.json
index b7455552..b62c5f8a 100644
--- a/build-aux/flatpak/org.gnome.Boxes.json
+++ b/build-aux/flatpak/org.gnome.Boxes.json
@@ -30,6 +30,16 @@
         }
     },
     "modules" : [
+        {   "name" : "libarchive",
+            "buildsystem" : "autotools",
+            "sources" : [
+                {
+                    "type" : "archive",
+                    "url" : "https://www.libarchive.org/downloads/libarchive-3.3.3.tar.gz";,
+                    "sha256" : "ba7eb1781c9fbbae178c4c6bad1c6eb08edab9a1496c64833d1715d022b30e2e"
+                }
+            ]
+        },
         {
             "name" : "mtools",
             "buildsystem" : "autotools",