[gnome-build-meta] Build polkit from tarball

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 1dc325c907dba4a5bf97da10452428001dafa2ac
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Mon Jul 6 18:31:47 2020 -0500

    Build polkit from tarball
    
    It's not releasing on our schedule after it bumps its dependencies, so
    building from git is not suitable. Sorry polkit.

 elements/core-deps/polkit.bst | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/elements/core-deps/polkit.bst b/elements/core-deps/polkit.bst
index 6892929c..96ce2a2c 100644
--- a/elements/core-deps/polkit.bst
+++ b/elements/core-deps/polkit.bst
@@ -1,9 +1,8 @@
 kind: autotools
 
 sources:
-- kind: git_tag
-  url: git_freedesktop_org:polkit/polkit.git
-  track: master
+- kind: tar
+  url: https://www.freedesktop.org/software/polkit/releases/polkit-0.116.tar.gz
 - kind: local
   path: files/polkit/sysusers.conf
   directory: data