tests: build_tools: exclude more broken selftest builds

Signed-off-by: Jakub Kicinski <[email protected]>

Author: kuba-moo

tests/patch/build_tools/build_tools.sh

@@ -33,7 +33,7 @@ echo "Now at:"
 git log -1 --pretty='%h ("%s")' HEAD
 
 # These are either very slow or don't build
-export SKIP_TARGETS="bpf dt kvm landlock livepatch lsm sched_ext user_events mm powerpc"
+export SKIP_TARGETS="bpf dt kvm landlock livepatch lsm sched_ext user_events mm powerpc filesystems/mount-notify ublk"
 
 pr "Cleaning"
 make O=$output_dir $build_flags -C tools/testing/selftests/ clean