clash with glibc.

Rev: src/lookup_verifier.h:1.6
Rev: src/lsh.c:1.103
Rev: src/lsh.h:1.14
Rev: src/lsh_proxy.c:1.9
Rev: src/server_authorization.c:1.11
Rev: src/server_password.c:1.29
Rev: src/server_publickey.c:1.12
Rev: src/server_session.c:1.31
Rev: src/server_session.h:1.8
Rev: src/server_userauth.h:1.8
Rev: src/unix_user.c:1.7