Keep the optional Xet accelerator off the OpenBSD dependency list.
The upstream client already falls back to ordinary HTTP downloads.

Index: setup.py
--- setup.py.orig
+++ setup.py
@@ -18,7 +18,7 @@
     "click>=8.4.2,<9.0.0",  # 8.4.0/8.4.1 shipped a broken fish completion script
     "filelock>=3.10.0",
     "fsspec>=2023.5.0",
-    f"{HF_XET_VERSION}; platform_machine=='x86_64' or platform_machine=='amd64' or platform_machine=='AMD64' or platform_machine=='arm64' or platform_machine=='aarch64'",
+    f"{HF_XET_VERSION}; platform_system!='OpenBSD' and (platform_machine=='x86_64' or platform_machine=='amd64' or platform_machine=='AMD64' or platform_machine=='arm64' or platform_machine=='aarch64')",
     "httpx>=0.23.0, <1",
     "packaging>=20.9",
     "pyyaml>=5.1",
