Merge remote branch 'h-github/master' into win32-port2

Merge remote branch 'h-github/master' into win32-port2

* h-github/master: (64 commits)
  refix socket wrappers with rk_
  Patch from Secure Endpoints/Asanka Herath for windows support
  unset KRB5CCNAME
  its really just LIBADD more most of them
  correct quoting
  Use -lpthread for modern freebsd instead
  clean KRB5CCNAME and KRB5_CONFIG, require test to reset them
  more up ${env_setup}
  use PTHREADS_LIBADD for freebsd6 and newer
  add PTHREAD_LIBADD
  add PTHREAD_LIBADD
  add PTHREAD_LIBADD
  switch to PTHREADS_LIBADD
  log what the error string say too
  More debug logging
  sprinkle more 'echo "test failed"'
  sprinkle 'echo "test failed"'
  use calloc(), indent more prettier
  in sh, equal compare is really = for strings, not ==
  Check for duplicates, already loaded mechs
  ...

Conflicts (resolved):
	lib/krb5/auth_context.c
	lib/krb5/changepw.c
	lib/krb5/context.c
	lib/krb5/error_string.c
	lib/krb5/kuserok.c
	lib/krb5/libkrb5-exports.def.in
	lib/krb5/net_write.c
	lib/krb5/store_fd.c
	lib/krb5/test_cc.c
	lib/roken/strerror_r.c