[io grant] Rewrite .l on broken symlinks test
[io grant] Rewrite .l on broken symlinks test

- de-confuse $target/$name nomenclature
- make work with IO grant changes to symlink
- Catch exceptions on Windows and skip test, as symlink creation
    on Windows cries for admin privs. This addresses the failures
    in this test file reported in #197 and #232

bitrauser/roast,dogbert17/roast,bitrauser/roast,perl6/roast,dogbert17/roast