Import of code from heimdal

Import of code from heimdal

This commit updates the code imported from heimdal to
a3afa695ee3eb1ff5ad8de3e80c20d5049fce934 (switch-from-svn-to-git-1619-ga3afa69)

Upstream changes are:

Chas Williams (CONTRACTOR) (1):
      hcrypto: struct x64 doesn't need bitfields

Love Hornquist Astrand (1):
      Switch to ULL

Simon Wilkinson (1):
      hcrypto: Flag 64bit bit constants as long long

Change-Id: Ifc11c14942a2b283d7f5879de5bf88f53b290512
Reviewed-on: http://gerrit.openafs.org/3100
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>