pull up r24750 from trunk

pull up r24750 from trunk

 ------------------------------------------------------------------------
 r24750 | ghudson | 2011-03-28 19:35:54 -0400 (Mon, 28 Mar 2011) | 11 lines

 ticket: 6886
 target_version: 1.9.1
 tags: pullup

 Remove the weak key checks from the builtin rc4 enc provider.  There
 is no standards support for avoiding RC4 weak keys, so rejecting them
 causes periodic failures.  Heimdal and Microsoft do not check for weak
 keys.  Attacks based on these weak keys are probably thwarted by the
 use of a confounder, and even if not, the reduction in work factor is
 not terribly significant for 128-bit keys.

ticket: 6886
version_fixed: 1.9.2
status: resolved

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-9@24951 dc483132-0cff-0310-8789-dd5450dbe970