Log Message:
neon: update to 0.32.4.

Changes in release 0.32.4:
* Fix Digest regression in allowing implicit algorithm= (issue #88)
* Fix Digest to safely allow spaces in usernames (without userhash)
* ne_ssl_trust_default_ca() now uses the system's trusted CAs
  with GnuTLS where supported (matching behaviour of OpenSSL)