LU-16520 build: Move strscpy to libcfs common header

LU-16520 build: Move strscpy to libcfs common header

Ensure strscpy is available to lustre

Test-Parameters: trivial
Fixes: 0b406c91d17 ("LU-13642 lnet: modify lnet_inetdev to work with large NIDS")
Signed-off-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Change-Id: I0c3673c2aa7e6b61671521a8cabde8a364f7f6f8
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/49863
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: jsimmons <jsimmons@infradead.org>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: Petros Koutoupis <petros.koutoupis@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>