python-webpy: needs hashlib support in python

webpy uses hashlib for session handling, so ensure it is available:

web/session.py:    import hashlib
web/session.py:    sha1 = hashlib.sha1

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 543b0d50fbbb552296749d0cf18443aacfc6e58d)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/python-webpy/Config.in

@@ -1,6 +1,7 @@
 config BR2_PACKAGE_PYTHON_WEBPY
 	bool "python-webpy"
 	depends on BR2_PACKAGE_PYTHON
+	select BR2_PACKAGE_PYTHON_HASHLIB
 	help
 	  web.py is a web framework for Python that is as simple as it is
 	  powerful.