- In "latest-by-phase" log directory the symlinks to real log directories were not updated if they existed.

- When using compile-commands-linking, if you change the build-dir, the symlinks to compile_commands.json were not updated if they existed.

This happened because there was not a check of exit status of symlink perl function in these two cases. It returns the 0 status code in case of failure rather than throwing an exception.
Made a separate Util function "remake_symlink" to be able to reuse it.