security/py-yubikey-manager: patch missing FreeBSD backend support

PR:		254580
Reported by:	nwhitehorn

security/py-yubikey-manager/Makefile

@@ -1,5 +1,6 @@
 PORTNAME=	yubikey-manager
 PORTVERSION=	4.0.2
+PORTREVISION=	1
 CATEGORIES=	security python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}

security/py-yubikey-manager/files/patch-ykman_hid_____init____.py

@@ -0,0 +1,21 @@
+--- ykman/hid/__init__.py.orig	2021-04-12 07:23:08 UTC
++++ ykman/hid/__init__.py
+@@ -42,12 +42,15 @@ elif sys.platform.startswith("win32"):
+     from . import windows as backend
+ elif sys.platform.startswith("darwin"):
+     from . import macos as backend
++elif sys.platform.startswith("freebsd"):
++    backend = None
+ else:
+     raise Exception("Unsupported platform")
+ 
+-
+-list_otp_devices: Callable[[], List[OtpYubiKeyDevice]] = backend.list_devices
+-
++if backend is not None:
++    list_otp_devices: Callable[[], List[OtpYubiKeyDevice]] = backend.list_devices
++else:
++    list_otp_devices: Callable[[], List[OtpYubiKeyDevice]] = lambda: []
+ 
+ class CtapYubiKeyDevice(YkmanDevice):
+     """YubiKey FIDO USB HID device"""