[polari] flatpak: Use tarball release of fontconfig

[Florian Müllner <fmuellner src gnome org>]

commit 3d396c9242070b61aa0a84393612f7ee9caf60b8
Author: Florian Müllner <fmuellner gnome org>
Date:   Sat Sep 16 02:22:07 2017 +0200

    flatpak: Use tarball release of fontconfig
    
    Current git master is broken:
    https://bugs.freedesktop.org/show_bug.cgi?id=102801
    
    However as the changes required for color emoji support are now
    in the latest release, we don't need to depend on master anymore,
    so use that to unbreak the build.

 flatpak/org.gnome.Polari.json |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/flatpak/org.gnome.Polari.json b/flatpak/org.gnome.Polari.json
index 81a415d..8b05f76 100644
--- a/flatpak/org.gnome.Polari.json
+++ b/flatpak/org.gnome.Polari.json
@@ -146,8 +146,9 @@
             ],
             "sources": [
                 {
-                    "url": "https://anongit.freedesktop.org/git/fontconfig";,
-                    "type": "git"
+                    "url": "https://fontconfig.org/release/fontconfig-2.12.5.tar.bz2";,
+                    "type": "archive",
+                    "sha256": "e10ccf1e26b0968f61d81037af1147fea28e86bfd159ffd8cfd5a486da126ce4"
                 }
             ],
             "post-install": [