selftests/hid: skip tests with HID-BPF if udev-hid-bpf is not installed

udev-hid-bpf is still not installed everywhere, and we should probably
not assume it is installed automatically.

Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Peter Hutterer <[e-mail]>
Signed-off-by: Benjamin Tissoires <[e-mail]>

tools/testing/selftests/hid/tests/base.py

···
 import libevdev
 import os
 import pytest
+import shutil
 import subprocess
 import time
 
···
             script_dir = Path(os.path.dirname(os.path.realpath(__file__)))
             root_dir = (script_dir / "../../../../..").resolve()
             bpf_dir = root_dir / "drivers/hid/bpf/progs"
+
+            udev_hid_bpf = shutil.which("udev-hid-bpf")
+            if not udev_hid_bpf:
+                pytest.skip("udev-hid-bpf not found in $PATH, skipping")
 
             wait = False
             for _, rdesc_fixup in self.hid_bpfs: