'strcpy' is insecure as it does not provide bounding of the memory
buffer in general, so let's avoid it even here.

Change-Id: If39319a2df7ddd9297938bc0be67fe5f8a2af962
Reviewed-on: https://gerrit.libreoffice.org/27999Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>