textproc/py-sphinxcontrib-towncrier: Convert to USE_PYTHON=pep517

- Remove outdated PYTHON_REL check after lang/python37 removal
- Bump PORTREVISION for package change

textproc/py-sphinxcontrib-towncrier/Makefile

@@ -1,5 +1,6 @@
 PORTNAME=	sphinxcontrib-towncrier
 PORTVERSION=	0.3.2a0
+PORTREVISION=	1
 CATEGORIES=	textproc python
 MASTER_SITES=	PYPI
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
@@ -11,18 +12,16 @@ WWW=		https://github.com/sphinx-contrib/sphinxcontrib-towncrier
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
+BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}setuptools>=40.6.0:devel/py-setuptools@${PY_FLAVOR} \
+		${PYTHON_PKGNAMEPREFIX}setuptools_scm>=3.5:devel/py-setuptools_scm@${PY_FLAVOR} \
+		${PYTHON_PKGNAMEPREFIX}setuptools_scm_git_archive>=1.1:devel/py-setuptools_scm_git_archive@${PY_FLAVOR} \
+		${PYTHON_PKGNAMEPREFIX}wheel>=0:devel/py-wheel@${PY_FLAVOR}
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}sphinx>=0,1:textproc/py-sphinx@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}towncrier>=19.2:textproc/py-towncrier@${PY_FLAVOR}
 
 USES=		python
-USE_PYTHON=	autoplist concurrent distutils
+USE_PYTHON=	autoplist concurrent pep517
 
 NO_ARCH=	yes
 
-.include <bsd.port.pre.mk>
-
-.if ${PYTHON_REL} < 30800
-RUN_DEPENDS+=	${PYTHON_PKGNAMEPREFIX}importlib-metadata>=4:devel/py-importlib-metadata@${PY_FLAVOR}
-.endif
-
-.include <bsd.port.post.mk>
+.include <bsd.port.mk>