[cppyy] Do not run crashing test on macOS

Since commit c12392d ("[cling] Remove duplicate
EHFrameRegistrationPlugin"), this test is also crashing on mac14
with Intel processor. Since it is failing on all platforms,
restrict further where it is run to get back green builds.

Author: hahnjo

bindings/pyroot/cppyy/cppyy/test/test_datatypes.py

@@ -1,6 +1,6 @@
 import py, sys, pytest, os
 from pytest import mark, raises, skip
-from support import setup_make, pylong, pyunicode, IS_MAC_ARM
+from support import setup_make, pylong, pyunicode, IS_MAC, IS_MAC_ARM
 
 currpath = os.getcwd()
 test_dct = currpath + "/libdatatypesDict"
@@ -1260,7 +1260,7 @@ def run(self, f, buf, total):
         run(self, cppyy.gbl.sum_uc_data, buf, total)
         run(self, cppyy.gbl.sum_byte_data, buf, total)
 
-    @mark.xfail(run=not IS_MAC_ARM, reason = "Crashes on OS X ARM with" \
+    @mark.xfail(run=not IS_MAC, reason = "Fails on all platforms; crashes on macOS with " \
     "libc++abi: terminating due to uncaught exception")
     def test26_function_pointers(self):
         """Function pointer passing"""