package/python-django-enumfields: needs python3

python2 support has been dropped since version 2.0.0 and
https://github.com/hzdg/django-enumfields/commit/3a9f92d67b15d1ae57ef7fb087858b5597413f30
resulting in the following build failure since bump to version 2.1.1 in
commit bcb85b2e59902c1f570fb0545b38a677d088841f:

error:   File "/usr/lib/python2.7/site-packages/enumfields/fields.py", line 134
    *super().check(**kwargs),
    ^
SyntaxError: invalid syntax

Fixes:
 - http://autobuild.buildroot.org/results/3fd79ed7bbcad202fc7ac07252cdf57c599dac30

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/python-django-enumfields/Config.in

@@ -1,6 +1,6 @@
 config BR2_PACKAGE_PYTHON_DJANGO_ENUMFIELDS
 	bool "python-django-enumfields"
-	select BR2_PACKAGE_PYTHON_ENUM34 if BR2_PACKAGE_PYTHON # runtime
+	depends on BR2_PACKAGE_PYTHON3
 	help
 	  Real Python Enums for Django.