Don't run assembly tests on GNUStep

Author: madsmtm

.github/workflows/ci.yml

@@ -324,6 +324,10 @@ jobs:
         args: --features ${{ env.FEATURES }},${{ env.UNSTABLE_FEATURES }} ${{ env.TESTARGS }}
 
     - name: Run assembly tests
+      # Not run on GNUStep yet since a lot of function labels are mangled and
+      # not inlined (and hence quite hard to match on, at some point we'll
+      # need to find a solution to that).
+      if: ${{ !contains(matrix.os, 'ubuntu') }}
       shell: bash
       run:
         export HOST_TARGET=$(rustc -vV | grep host | cut -f2 -d' ')