python-cython: Add new host-only package

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

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

lang/python/python-cython/Makefile

@@ -0,0 +1,57 @@
+#
+# 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-cython
+PKG_VERSION:=0.29.33
+PKG_RELEASE:=1
+
+PYPI_NAME:=Cython
+PKG_HASH:=5040764c4a4d2ce964a395da24f0d1ae58144995dab92c6b96f44c3f4d72286a
+
+PKG_LICENSE:=Apache-2.0
+PKG_LICENSE_FILES:=LICENSE.txt
+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 $(INCLUDE_DIR)/host-build.mk
+include ../python3-package.mk
+include ../python3-host-build.mk
+
+define Package/python3-cython
+  SECTION:=lang
+  CATEGORY:=Languages
+  SUBMENU:=Python
+  TITLE:=Cython compiler for writing C extensions
+  URL:=https://cython.org/
+  DEPENDS:=+python3
+  BUILDONLY:=1
+endef
+
+define Package/python3-cython/description
+Cython is a language that makes writing C extensions for Python as easy
+as Python itself. Cython is based on Pyrex, but supports more cutting
+edge functionality and optimizations.
+
+The Cython language is very close to the Python language, but Cython
+additionally supports calling C functions and declaring C types on
+variables and class attributes. This allows the compiler to generate
+very efficient C code from Cython code.
+
+This makes Cython the ideal language for wrapping external C libraries,
+and for fast C modules that speed up the execution of Python code.
+endef
+
+$(eval $(call Py3Package,python3-cython))
+$(eval $(call BuildPackage,python3-cython))
+$(eval $(call BuildPackage,python3-cython-src))
+$(eval $(call HostBuild))