python-build: Add new host-only package

From the documentation:

A simple, correct PEP 517 build frontend.

build will invoke the PEP 517 hooks to build a distribution package. It
is a simple build tool and does not perform any dependency management.

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

lang/python/python-build/Makefile

@@ -0,0 +1,58 @@
+#
+# Copyright (C) 2023 Jeffery To
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=python-build
+PKG_VERSION:=0.10.0
+PKG_RELEASE:=1
+
+PYPI_NAME:=build
+PKG_HASH:=d5b71264afdb5951d6704482aac78de887c80691c52b88a9ad195983ca2c9269
+
+PKG_LICENSE:=MIT
+PKG_LICENSE_FILES:=LICENSE
+PKG_MAINTAINER:=Jeffery To <jeffery.to@gmail.com>
+
+PKG_HOST_ONLY:=1
+HOST_BUILD_DEPENDS:= \
+	python3/host \
+	python-installer/host \
+	python-flit-core/host \
+	python-packaging/host \
+	python-pyproject-hooks/host \
+	python-tomli/host
+
+PYTHON3_HOST_BUILD_VARS:=PYTHONPATH=src
+
+include ../pypi.mk
+include $(INCLUDE_DIR)/package.mk
+include $(INCLUDE_DIR)/host-build.mk
+include ../python3-package.mk
+include ../python3-host-build.mk
+
+define Package/python3-build
+  SECTION:=lang
+  CATEGORY:=Languages
+  SUBMENU:=Python
+  TITLE:=A simple, correct Python build frontend
+  URL:=https://github.com/pypa/build
+  DEPENDS:=+python3-light +python3-logging
+  BUILDONLY:=1
+endef
+
+define Package/python3-build/description
+A simple, correct PEP 517 build frontend.
+
+build will invoke the PEP 517 hooks to build a distribution package. It
+is a simple build tool and does not perform any dependency management.
+endef
+
+$(eval $(call Py3Package,python3-build))
+$(eval $(call BuildPackage,python3-build))
+$(eval $(call BuildPackage,python3-build-src))
+$(eval $(call HostBuild))