[gnome-build-meta/jjardon/dwinship/update-aliases: 15/15] Update Aliases: Add dummy refs to cargo sources

[Javier Jardón <jjardon src gnome org>]

commit baf12252ddbc8ce79d9222b976461b722aae9b19
Author: Douglas Winship <douglas winship codethink co uk>
Date:   Wed Sep 1 21:24:22 2021 +0100

    Update Aliases: Add dummy refs to cargo sources

 elements/core-deps/slirp-helper.bst | 3 +++
 elements/core/gnome-tour.bst        | 3 +++
 elements/sdk/librsvg.bst            | 3 +++
 3 files changed, 9 insertions(+)
---
diff --git a/elements/core-deps/slirp-helper.bst b/elements/core-deps/slirp-helper.bst
index 6e040ef4..b19614f5 100644
--- a/elements/core-deps/slirp-helper.bst
+++ b/elements/core-deps/slirp-helper.bst
@@ -15,6 +15,9 @@ sources:
   url: file_https:static.crates.io/crates/libslirp/libslirp-4.3.0.crate
 - kind: cargo
   url: crates:crates
+  ref:
+  - name: null      # Dummy ref, needed to avoid
+    version: null   # https://gitlab.com/BuildStream/bst-external/-/issues/53
 - kind: patch
   path: files/slirp-helper/nix-riscv.patch
 
diff --git a/elements/core/gnome-tour.bst b/elements/core/gnome-tour.bst
index bfde7d85..a611f422 100644
--- a/elements/core/gnome-tour.bst
+++ b/elements/core/gnome-tour.bst
@@ -5,6 +5,9 @@ sources:
   track: master
 - kind: cargo
   url: crates:crates
+  ref:
+  - name: null      # Dummy ref, needed to avoid
+    version: null   # https://gitlab.com/BuildStream/bst-external/-/issues/53
 build-depends:
 - freedesktop-sdk.bst:components/rust.bst
 - freedesktop-sdk.bst:public-stacks/buildsystem-meson.bst
diff --git a/elements/sdk/librsvg.bst b/elements/sdk/librsvg.bst
index 5756b754..dfdc294e 100644
--- a/elements/sdk/librsvg.bst
+++ b/elements/sdk/librsvg.bst
@@ -5,6 +5,9 @@ sources:
   track: master
 - kind: cargo
   url: crates:crates
+  ref:
+  - name: null      # Dummy ref, needed to avoid
+    version: null   # https://gitlab.com/BuildStream/bst-external/-/issues/53
 build-depends:
 - sdk/gobject-introspection.bst
 - sdk/gtk-doc.bst