opensubdiv: 3.3.0 -> 3.3.1

Semi-automatic update. These checks were done:

- built on NixOS
- Warning: no binary found that responded to help or version flags. (This warning appears even if the package isn't expected to have binaries.)
- found 3.3.1 with grep in /nix/store/68xswr0fs8b098ww8l832z2gljmfgpwd-opensubdiv-3.3.1
- found 3.3.1 in filename of file in /nix/store/68xswr0fs8b098ww8l832z2gljmfgpwd-opensubdiv-3.3.1