[quadrapassel/gnome-3-38] snap: don't try to use multilib on arches not having those

[Sebastien Bacher <sbacher src gnome org>]

commit 685908e7c201e6d09a5a18131eebf578f6024c24
Author: seb128 <seb128 ubuntu com>
Date:   Thu Dec 10 15:30:14 2020 +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 0578cf8..706213e 100644
--- a/snap/snapcraft.yaml
+++ b/snap/snapcraft.yaml
@@ -33,8 +33,9 @@ parts:
     source: https://github.com/sergiusens/snapcraft-preload.git
     plugin: cmake
     build-packages:
-      - gcc-multilib
-      - g++-multilib
+      - on amd64:
+          - gcc-multilib
+          - g++-multilib
 
   libcanberra:
     source: git://git.0pointer.de/libcanberra