upstream: only clang understands those new -W options

OpenBSD-Commit-ID: d9b910e412d139141b072a905e66714870c38ac0
diff --git a/.skipped-commit-ids b/.skipped-commit-ids
index 5568112..ac469cf 100644
--- a/.skipped-commit-ids
+++ b/.skipped-commit-ids
@@ -15,6 +15,7 @@
 4bd5551b306df55379afe17d841207990eb773bf	Makefile.inc
 14806a59353152f843eb349e618abbf6f4dd3ada	Makefile.inc
 8ea4455a2d9364a0a04f9e4a2cbfa4c9fcefe77e	Makefile.inc
+d9b910e412d139141b072a905e66714870c38ac0	Makefile.inc
 
 Old upstream tree: