[gnome-build-meta] Revert "flatpak-runtimes: add platform extensions"

[Michael Catanzaro <mcatanzaro src gnome org>]

commit ff0cb170adbfc3ec73992c83610342ebd5a666a5
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Sat Jun 22 12:45:37 2019 -0500

    Revert "flatpak-runtimes: add platform extensions"
    
    This reverts commit 57bad5053844f01a3170c907a50de804d3384e24.

 elements/flatpak-runtimes.bst | 9 ---------
 1 file changed, 9 deletions(-)
---
diff --git a/elements/flatpak-runtimes.bst b/elements/flatpak-runtimes.bst
index 57b3ff18..abdd9ce8 100644
--- a/elements/flatpak-runtimes.bst
+++ b/elements/flatpak-runtimes.bst
@@ -4,15 +4,6 @@ depends:
   type: build
 - filename: flatpak/platform-locale.bst
   type: build
-- filename: flatpak-images/platform-vaapi.bst
-  junction: freedesktop-sdk.bst
-  type: build
-- filename: flatpak-images/platform-ffmpeg-html5.bst
-  junction: freedesktop-sdk.bst
-  type: build
-- filename: flatpak-images/mesa.bst
-  junction: freedesktop-sdk.bst
-  type: build
 - filename: flatpak/sdk.bst
   type: build
 - filename: flatpak/sdk-debug.bst