skipping: use pytest_runtest_call instead of pytest_pyfunc_call

`@pytest.mark.xfail` is meant to work with arbitrary items, and there is
a test `test_mark_xfail_item` which verifies this.

However, the code for some reason uses `pytest_pyfunc_call` for the
call phase check, which only works for Function items. The test
mentioned above only passed "accidentally" because the
`pytest_runtest_makereport` hook also runs a `evalxfail.istrue()` which
triggers and evaluation, but conceptually it shouldn't do that.

Change to `pytest_runtest_call` to make the xfail checking properly
generic.

src/_pytest/skipping.py

@@ -10,7 +10,6 @@ from _pytest.nodes import Item
 from _pytest.outcomes import fail
 from _pytest.outcomes import skip
 from _pytest.outcomes import xfail
-from _pytest.python import Function
 from _pytest.reports import BaseReport
 from _pytest.runner import CallInfo
 from _pytest.store import StoreKey
@@ -103,12 +102,12 @@ def pytest_runtest_setup(item: Item) -> None:
 
 
 @hookimpl(hookwrapper=True)
-def pytest_pyfunc_call(pyfuncitem: Function):
-    check_xfail_no_run(pyfuncitem)
+def pytest_runtest_call(item: Item):
+    check_xfail_no_run(item)
     outcome = yield
     passed = outcome.excinfo is None
     if passed:
-        check_strict_xfail(pyfuncitem)
+        check_strict_xfail(item)
 
 
 def check_xfail_no_run(item: Item) -> None:
@@ -120,14 +119,14 @@ def check_xfail_no_run(item: Item) -> None:
                 xfail("[NOTRUN] " + evalxfail.getexplanation())
 
 
-def check_strict_xfail(pyfuncitem: Function) -> None:
+def check_strict_xfail(item: Item) -> None:
     """check xfail(strict=True) for the given PASSING test"""
-    evalxfail = pyfuncitem._store[evalxfail_key]
+    evalxfail = item._store[evalxfail_key]
     if evalxfail.istrue():
-        strict_default = pyfuncitem.config.getini("xfail_strict")
+        strict_default = item.config.getini("xfail_strict")
         is_strict_xfail = evalxfail.get("strict", strict_default)
         if is_strict_xfail:
-            del pyfuncitem._store[evalxfail_key]
+            del item._store[evalxfail_key]
             explanation = evalxfail.getexplanation()
             fail("[XPASS(strict)] " + explanation, pytrace=False)