python-calver: Add new host-only package

From the README:

The calver package is a setuptools extension for automatically defining
your Python package version as a calendar version.

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

lang/python/python-calver/Makefile

@@ -0,0 +1,48 @@
+#
+# 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-calver
+PKG_VERSION:=2022.6.26
+PKG_RELEASE:=1
+
+PYPI_NAME:=calver
+PKG_HASH:=e05493a3b17517ef1748fbe610da11f10485faa7c416b9d33fd4a52d74894f8b
+
+PKG_LICENSE:=Apache-2.0
+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
+
+include ../pypi.mk
+include $(INCLUDE_DIR)/package.mk
+include $(INCLUDE_DIR)/host-build.mk
+include ../python3-package.mk
+include ../python3-host-build.mk
+
+define Package/python3-calver
+  SECTION:=lang
+  CATEGORY:=Languages
+  SUBMENU:=Python
+  TITLE:=Setuptools extension for CalVer package versions
+  URL:=https://github.com/di/calver
+  DEPENDS:=+python3-light
+  BUILDONLY:=1
+endef
+
+define Package/python3-calver/description
+The calver package is a setuptools extension for automatically defining
+your Python package version as a calendar version.
+endef
+
+$(eval $(call Py3Package,python3-calver))
+$(eval $(call BuildPackage,python3-calver))
+$(eval $(call BuildPackage,python3-calver-src))
+$(eval $(call HostBuild))