security/py-vpn-slice: Convert to USE_PYTHON=pep517

- Bump PORTREVISION for package change

security/py-vpn-slice/Makefile

 PORTNAME=	vpn-slice
 PORTVERSION=	0.16.1
+PORTREVISION=	1
 CATEGORIES=	security python net-vpn
 MASTER_SITES=	PYPI
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
@@ -11,11 +12,13 @@ WWW=		https://github.com/dlenski/vpn-slice
 LICENSE=	GPLv3+
 LICENSE_FILE=	${WRKSRC}/LICENSE.txt
 
+BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}setuptools>=0:devel/py-setuptools@${PY_FLAVOR} \
+		${PYTHON_PKGNAMEPREFIX}wheel>=0:devel/py-wheel@${PY_FLAVOR}
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}dnspython>=0,1:dns/py-dnspython@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}setproctitle>=0:devel/py-setproctitle@${PY_FLAVOR}
 
 USES=		python
-USE_PYTHON=	autoplist concurrent distutils
+USE_PYTHON=	autoplist concurrent pep517
 
 NO_ARCH=	yes