All reports of symlink-has-double-slash for the archive. The extended description of this tag is:
This symlink contains two successive slashes (//). This is in violation of policy, where it is stated that symlinks should be as short as possible
If you use debhelper, running dh_link after creating the package structure will fix this problem for you.
Refer to Debian Policy Manual section 10.5 (Symbolic links) for details.
This tag has not been emitted in any package tested by Lintian.