buildroot

python, python3: enable unicodedata for host-python, needed by setuptools

As we are going to bump setuptools to a much newer version, the host
python needs to be built with support for unicodedata.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>