Libdvdread fix for SMB, NFS, VIDEO_TS files (non-Windows platforms) - Part 2

follow up to #2723 - after further investigation concluded that it's better to get rid of the symlink resolution block in libdvdread.
symlink resolution only works partially with our wrapped VFS, because 3 function calls - chdir, fchdir, getcwd - are not wrapped and our VFS can handle symlinks correctly anyway.