create/extract: ignore OSError if ACLs are not supported (ENOTSUP)

but do not silence other OSErrors.

src/borg/archive.py

@@ -902,7 +902,11 @@ Utilization of max. archive size: {csize_max:.0%}
                     if not symlink:
                         os.chmod(path, item.mode)
             if not self.noacls:
-                acl_set(path, item, self.numeric_ids, fd=fd)
+                try:
+                    acl_set(path, item, self.numeric_ids, fd=fd)
+                except OSError as e:
+                    if e.errno not in (errno.ENOTSUP, ):
+                        raise
             if not self.noxattrs:
                 # chown removes Linux capabilities, so set the extended attributes at the end, after chown, since they include
                 # the Linux capabilities in the "security.capability" attribute.
@@ -1165,7 +1169,11 @@ class MetadataCollector:
                 attrs['xattrs'] = StableDict(xattrs)
         if not self.noacls:
             with backup_io('extended stat (ACLs)'):
-                acl_get(path, attrs, st, self.numeric_ids, fd=fd)
+                try:
+                    acl_get(path, attrs, st, self.numeric_ids, fd=fd)
+                except OSError as e:
+                    if e.errno not in (errno.ENOTSUP, ):
+                        raise
         return attrs
 
     def stat_attrs(self, st, path, fd=None):