test-hardlink: do not test .hg/cache/checklink Linux and BSD have different behavior on "os.link(src, dst)" where "src" is a symlink. That causes test difference. According to POSIX [1]: If path1 names a symbolic link, it is implementation-defined whether link() follows the symbolic link, or creates a new link to the symbolic link itself. So both behaviors are correct. This patch removes the trouble maker "checklink" to make the test pass on both platforms. [1]: http://pubs.opengroup.org/onlinepubs/9699919799/functions/link.html