No aarch64 sbbs build

Now that I've upgraded my RPi 400 to aarch64, it turns out aarch64
isn't supported by Spidermoney or the libffi it ships with, so
there's no easy way to make it build.

Untill Spidermonkey is updated, there's just no reasonable way to
build on aarch64.

.gitlab-ci.yml

@@ -23,22 +23,6 @@ sbbs-linux:
       - "src/sbbs3/*.lib.release/*"
       - "src/sbbs3/*/*.exe.release/*"
 
-sbbs-raspian:
-  tags: [RaspberryPi]
-  image: gcc
-  stage: build
-  extends: .rules
-  script:
-    - cd src/sbbs3
-    - make RELEASE=1 all
-    - make RELEASE=1 gtkutils
-  artifacts:
-    name: sbbs-linux-x64
-    paths:
-      - "src/sbbs3/*.exe.release/*"
-      - "src/sbbs3/*.lib.release/*"
-      - "src/sbbs3/*/*.exe.release/*"
-
 sexpots-linux:
   tags: [Linux]
   image: gcc