python-greenlet: add new package

Notes:
Build is disabled for arc and mips because
greenlet isn't ported for these platforms

Signed-off-by: Jan Pavlinec <jan.pavlinec@nic.cz>

lang/python/python-greenlet/Makefile

@@ -0,0 +1,44 @@
+#
+# Copyright (C) 2021 CZ.NIC, z. s. p. o. (https://www.nic.cz/)
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=python-greenlet
+PKG_VERSION:=1.0.0
+PKG_RELEASE:=1
+
+PYPI_NAME:=greenlet
+PKG_HASH:=719e169c79255816cdcf6dccd9ed2d089a72a9f6c42273aae12d55e8d35bdcf8
+
+PKG_MAINTAINER:=Jan Pavlinec <jan.pavlinec@nic.cz>
+PKG_LICENSE:=MIT
+PKG_LICENSE_FILES:=LICENSE
+
+include ../pypi.mk
+include $(INCLUDE_DIR)/package.mk
+include ../python3-package.mk
+
+define Package/python3-greenlet
+  SUBMENU:=Python
+  SECTION:=lang
+  CATEGORY:=Languages
+  TITLE:=Lightweight coroutines for in-process concurrent programming
+  URL:=https://github.com/python-greenlet/greenlet
+  DEPENDS:= \
+	+python3-light \
+	+libstdcpp \
+	@!(arc||mips)
+endef
+
+define Package/python3-greenlet/description
+  The greenlet package is a spin-off of Stackless
+  a version of CPython that supports micro-threads called tasklets.
+endef
+
+$(eval $(call Py3Package,python3-greenlet))
+$(eval $(call BuildPackage,python3-greenlet))
+$(eval $(call BuildPackage,python3-greenlet-src))