pull up r25367 from trunk

pull up r25367 from trunk

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 r25367 | ghudson | 2011-10-18 12:32:28 -0400 (Tue, 18 Oct 2011) | 12 lines

 ticket: 6980
 subject: Ensure termination in Windows vsnprintf wrapper
 target_version: 1.10
 tags: pullup

 The Windows _vsnprintf does not terminate its output buffer in the
 overflow case.  Make sure we do that in the wrapper.  Reported by
 Chris Hecker.

 (Not an issue for KfW 3.2 since we weren't using snprintf in 1.6.x
 except in Unix-specific code.)

ticket: 6980
version_fixed: 1.10
status: resolved

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-10@25386 dc483132-0cff-0310-8789-dd5450dbe970