Added !SSPI to the features list of the HTTP digest tests, as SSPI based builds now use the Windows SSPI messaging API rather than the internal functions, and we can't control the random numbers that get used as part of the digest.
This test case verifies that bug 3582718 is fixed. Bug: http://curl.haxx.se/bug/view.cgi?id=3582718 Reported by: Nick Zitzmann (originally)