Fix multiarch issues in libgsecuredelete packaging
libgsecuredelete-dev could be marked Multi-Arch: same
libgsecuredelete0 could be marked Multi-Arch: same
Original created by @u on 14647 (Redmine)
libgsecuredelete-dev could be marked Multi-Arch: same
libgsecuredelete0 could be marked Multi-Arch: same
Original created by @u on 14647 (Redmine)