django-restframework: fix by splitting variants

Split python2 and python3 packages and update to newest versions:
  * python-django-restframework version 3.9.4 using django1
  * python3-django-restframework version 3.11.0 using django3
This fixes the issue that the restframework cannot import name
'python_2_unicode_compatible' from 'django.utils.encoding', when
using version 3.9.x together with Django 3.y.

Signed-off-by: Peter Stadler <peter.stadler@student.uibk.ac.at>

lang/python/django1-restframework/Makefile

@@ -0,0 +1,42 @@
+#
+# Copyright (C) 2007-2017 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=django1-restframework
+PKG_VERSION:=3.9.4
+PKG_RELEASE:=1
+
+PYPI_NAME:=djangorestframework
+PKG_HASH:=c12869cfd83c33d579b17b3cb28a2ae7322a53c3ce85580c2a2ebe4e3f56c4fb
+
+PKG_MAINTAINER:=Alexandru Ardelean <ardeleanalex@gmail.com>
+PKG_LICENSE:=BSD-3-Clause
+PKG_LICENSE_FILES:=LICENSE.md
+
+include ../pypi.mk
+include $(INCLUDE_DIR)/package.mk
+include ../python-package.mk
+
+define Package/python-django-restframework
+  SUBMENU:=Python
+  SECTION:=lang
+  CATEGORY:=Languages
+  TITLE:=Web APIs for Django, made easy.
+  URL:=https://www.django-rest-framework.org
+  DEPENDS:=+python python-django1
+  VARIANT:=python
+  MDEPENDS:=python-django1
+endef
+
+define Package/python-django-restframework/description
+  Web APIs for Django, made easy.
+endef
+
+$(eval $(call PyPackage,python-django-restframework))
+$(eval $(call BuildPackage,python-django-restframework))
+$(eval $(call BuildPackage,python-django-restframework-src))