As we require Python3 since commit ddf90699, we don't need to
explicit it with the --python=/usr/bin/python3 configure option.

Reported-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20200125184217.30034-1-f4bug@amsat.org>
Message-Id: <20200203090932.19147-8-alex.bennee@linaro.org>