Make HPCCProblemSize.notest own file instead of symlink from original location

Making it a symlink was unnecessary laziness on my part, as notests are just
empty files.
Merge pull request #1062 from lydia-duncan/resolveSymlinkPerfErrors1

Make HPCCProblemSize.notest own file instead of symlink from original location

Making it a symlink was unnecessary laziness on my part, as notests are just
empty files.