package/python-flask: fix runtime python modules dependencies

- add python setuptools runtime dependency, fixes:
  ModuleNotFoundError: No module named 'pkg_resources'

- add python libxml2 runtime dependency, fixes:
  ModuleNotFoundError: No module named 'xml'

- add python ssl runtime dependency, fixes:
  AttributeError: 'NoneType' object has no attribute 'SSLContext'

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/python-flask/Config.in

@@ -2,8 +2,12 @@ config BR2_PACKAGE_PYTHON_FLASK
 	bool "python-flask"
 	select BR2_PACKAGE_PYTHON_CLICK # runtime
 	select BR2_PACKAGE_PYTHON_JINJA2 # runtime
+	select BR2_PACKAGE_PYTHON_LXML # runtime
 	select BR2_PACKAGE_PYTHON_WERKZEUG # runtime
 	select BR2_PACKAGE_PYTHON_ITSDANGEROUS # runtime
+	select BR2_PACKAGE_PYTHON_SETUPTOOLS # runtime
+	select BR2_PACKAGE_PYTHON_SSL if BR2_PACKAGE_PYTHON
+	select BR2_PACKAGE_PYTHON3_SSL if BR2_PACKAGE_PYTHON3
 	select BR2_PACKAGE_PYTHON_ZLIB if BR2_PACKAGE_PYTHON
 	select BR2_PACKAGE_PYTHON3_ZLIB if BR2_PACKAGE_PYTHON3
 	help