Fix implicit declaration in ksu for some builds

Fix implicit declaration in ksu for some builds

Pull up r25605 from trunk

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 r25605 | ghudson | 2011-12-27 20:31:59 -0500 (Tue, 27 Dec 2011) | 7 lines

 ticket: 7057

 Fix implicit declaration in ksu for some builds

 ksu's setenv implementation needs to include <string.h> for memcpy.
 Patch from basch@alum.mit.edu.

ticket: 7068
version_fixed: 1.9.3
status: resolved

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-9@25640 dc483132-0cff-0310-8789-dd5450dbe970