Fix file permissions of package.py on Windows
Fix file permissions of package.py on Windows

They aren't supported on Windows, and result in read-only file permissions which cannot be overwritten and breaks building of variants amongst others, see https://docs.python.org/2/library/os.html#os.chmod
Cosmetics

instinct-vfx/rez,nerdvegas/rez,nerdvegas/rez,instinct-vfx/rez