Fix detection of libaceclnt for securid_sam2

The symbol we need is SD_Init(), not sd_init().

(cherry picked from commit 081ee2f7d98b939bf7b4866845d4243b5ca3992c)

https://github.com/krb5/krb5/commit/6af51bee2e2bdcb7ccb6636de73da0c8ead21a28
Author: Greg Hudson <ghudson@mit.edu>
Committer: Tom Yu <tlyu@mit.edu>
Commit: 6af51bee2e2bdcb7ccb6636de73da0c8ead21a28
Branch: krb5-1.14
 src/configure.in |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)