python-setuptools-scm: Add new host-only package

The host build replaces the use of the host pip requirements file. This
also updates the dependants of setuptools-scm to depend on the host
build.

This also removes the toml host pip requirements file as toml is not
used by any other package.

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

lang/python/python-setuptools-scm/Makefile

@@ -0,0 +1,68 @@
+#
+# 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-setuptools-scm
+PKG_VERSION:=7.1.0
+PKG_RELEASE:=1
+
+PYPI_NAME:=setuptools-scm
+PYPI_SOURCE_NAME:=setuptools_scm
+PKG_HASH:=6c508345a771aad7d56ebff0e70628bf2b0ec7573762be9960214730de278f27
+
+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-build/host \
+	python-installer/host \
+	python-wheel/host \
+	python-packaging/host \
+	python-tomli/host \
+	python-typing-extensions/host
+
+include ../pypi.mk
+include $(INCLUDE_DIR)/package.mk
+include $(INCLUDE_DIR)/host-build.mk
+include ../python3-package.mk
+include ../python3-host-build.mk
+
+define Package/python3-setuptools-scm
+  SECTION:=lang
+  CATEGORY:=Languages
+  SUBMENU:=Python
+  TITLE:=the blessed package to manage your versions by scm tags
+  URL:=https://github.com/pypa/setuptools_scm
+  DEPENDS:= \
+      +python3-light \
+      +python3-logging \
+      +python3-packaging \
+      +python3-setuptools \
+      +python3-tomli \
+      +python3-typing-extensions
+  BUILDONLY:=1
+endef
+
+define Package/python3-setuptools-scm/description
+setuptools_scm extracts Python package versions from git or hg metadata
+instead of declaring them as the version argument or in a SCM managed
+file.
+
+Additionally setuptools_scm provides setuptools with a list of files
+that are managed by the SCM (i.e. it automatically adds all of the
+SCM-managed files to the sdist). Unwanted files must be excluded by
+discarding them via MANIFEST.in.
+endef
+
+$(eval $(call Py3Package,python3-setuptools-scm))
+$(eval $(call BuildPackage,python3-setuptools-scm))
+$(eval $(call BuildPackage,python3-setuptools-scm-src))
+$(eval $(call HostBuild))