[swell-foop/gnome-3-36] snap: don't try to use multilib on arches not having those

[Sebastien Bacher <sbacher src gnome org>]

commit 6ff8b53c4cdbe87ce0d6b76914da53b0eddc80a2
Author: Sebastien Bacher <seb128 ubuntu com>
Date:   Tue Mar 16 16:57:20 2021 +0100

    snap: don't try to use multilib on arches not having those

 snap/snapcraft.yaml | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/snap/snapcraft.yaml b/snap/snapcraft.yaml
index 0e2454c..5ba5b12 100644
--- a/snap/snapcraft.yaml
+++ b/snap/snapcraft.yaml
@@ -44,8 +44,9 @@ parts:
     source: https://github.com/sergiusens/snapcraft-preload.git
     plugin: cmake
     build-packages:
-      - gcc-multilib
-      - g++-multilib
+      - on amd64:
+          - gcc-multilib
+          - g++-multilib
 
   swell-foop:
     source: .