pullup r17377 and r17382 from trunk. Commit By: tlyu Revision: 17389 Changed Files: U branches/krb5-1-4/src/ChangeLog U branches/krb5-1-4/src/aclocal.m4 U branches/krb5-1-4/src/lib/krb5/os/ChangeLog U branches/krb5-1-4/src/lib/krb5/os/dnsglue.c