devel/py-build: Convert to USE_PYTHON=pep517

- Add build for all Python flavors/versions (USE_PYTHON=allflavors)
- Bump PORTREVISION for dependency and package change

devel/py-build/Makefile

@@ -1,5 +1,6 @@
 PORTNAME=	build
 PORTVERSION=	0.10.0
+PORTREVISION=	1
 CATEGORIES=	devel python
 MASTER_SITES=	PYPI
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
@@ -14,11 +15,14 @@ LICENSE_FILE=	${WRKSRC}/LICENSE
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}packaging>=19.0:devel/py-packaging@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}pyproject_hooks>=0:devel/py-pyproject_hooks@${PY_FLAVOR}
 
-USES=		python:3.7+
-USE_PYTHON=	autoplist concurrent distutils
+USES=		python
+USE_PYTHON=	allflavors autoplist concurrent pep517
 
 NO_ARCH=	yes
 
+PEP517_BUILD_CMD=	${PYTHON_CMD} -m flit_core.wheel
+PEP517_BUILD_DEPEND=	${PYTHON_PKGNAMEPREFIX}flit-core>=3.4:devel/py-flit-core@${PY_FLAVOR}
+
 .include <bsd.port.pre.mk>
 
 .if ${PYTHON_REL} < 30800
@@ -29,7 +33,4 @@ RUN_DEPENDS+= ${PYTHON_PKGNAMEPREFIX}importlib-metadata>=0.22:devel/py-importlib
 RUN_DEPENDS+=	${PYTHON_PKGNAMEPREFIX}tomli>=1.1.0:textproc/py-tomli@${PY_FLAVOR}
 .endif
 
-post-patch:
-	@${SED} -e 's|%%PORTVERSION%%|${PORTVERSION}|' ${FILESDIR}/setup.py > ${WRKSRC}/setup.py
-
 .include <bsd.port.post.mk>