Make the new allowlist entries optional

Co-authored-by: Sebastian Rittau <srittau@rittau.biz>

Author: tungol

stdlib/@tests/stubtest_allowlists/linux.txt

@@ -28,13 +28,13 @@ multiprocessing.popen_spawn_win32  # exists on Linux but fails to import
 select.poll  # Actually a function; we have a class so it can be used as a type
 
 # Bluetooth constants which aren't on the GitHub Actions runners, see #15207
-_?socket.AF_BLUETOOTH
-_?socket.BDADDR_ANY
-_?socket.BDADDR_LOCAL
-_?socket.BTPROTO_HCI
-_?socket.BTPROTO_L2CAP
-_?socket.BTPROTO_RFCOMM
-_?socket.BTPROTO_SCO
+(_?socket\.AF_BLUETOOTH)?
+(_?socket\.BDADDR_ANY)?
+(_?socket\.BDADDR_LOCAL)?
+(_?socket\.BTPROTO_HCI)?
+(_?socket\.BTPROTO_L2CAP)?
+(_?socket\.BTPROTO_RFCOMM)?
+(_?socket\.BTPROTO_SCO)?
 
 # These seem like they should be available on Linux, but they're not
 # on GitHub Actions runners for some reason.