This fixes the latest `dlib` build for `nixpkgs` compliancy:
* Patched `setup.py` to use number of jobs defined in `$NIX_BUILD_CORES`
rather than using all available cores.
* Bumped `dlib` to latest version (v19.13 ATM).
* Dropped `openblas` build input, `cblas` which actually works lives in
`dlib/external`. Otherwise the test suite runs into segfaults (see
https://github.com/NixOS/nixpkgs/pull/39255#issuecomment-384535129 for
further reference).
* Added myself as maintainer in case of any further breakage in the
future.
Closes#39255
/cc @dotlambda @ryantm
Semi-automatic update generated by https://github.com/ryantm/nix-update tools. 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 19.10 with grep in /nix/store/3h9m66pcyc428v616z3ls200aidd12wz-dlib-19.10
- directory tree listing: https://gist.github.com/7c3e568146e46ccdaed28be2916bd0a9
