package/python-flask: remove erroneously python-lxml dependency

Remove erroneously python-lxml dependency (as noted by
Peter Korsgaard).

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Reviewed-by: Sébastien Szymanski <sebastien.szymanski@armadeus.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/python-flask/Config.in

@@ -2,7 +2,6 @@ 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