Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/libraw/versions.

These checks were done:

- built on NixOS
- /nix/store/c152az463594l2si39h4assahzv5wv6r-libraw-0.19.0/bin/raw-identify passed the binary check.
- /nix/store/c152az463594l2si39h4assahzv5wv6r-libraw-0.19.0/bin/unprocessed_raw passed the binary check.
- /nix/store/c152az463594l2si39h4assahzv5wv6r-libraw-0.19.0/bin/4channels passed the binary check.
- /nix/store/c152az463594l2si39h4assahzv5wv6r-libraw-0.19.0/bin/simple_dcraw passed the binary check.
- /nix/store/c152az463594l2si39h4assahzv5wv6r-libraw-0.19.0/bin/mem_image passed the binary check.
- /nix/store/c152az463594l2si39h4assahzv5wv6r-libraw-0.19.0/bin/dcraw_half passed the binary check.
- /nix/store/c152az463594l2si39h4assahzv5wv6r-libraw-0.19.0/bin/half_mt passed the binary check.
- /nix/store/c152az463594l2si39h4assahzv5wv6r-libraw-0.19.0/bin/multirender_test passed the binary check.
- /nix/store/c152az463594l2si39h4assahzv5wv6r-libraw-0.19.0/bin/postprocessing_benchmark passed the binary check.
- /nix/store/c152az463594l2si39h4assahzv5wv6r-libraw-0.19.0/bin/dcraw_emu passed the binary check.
- 10 of 10 passed binary check by having a zero exit code.
- 0 of 10 passed binary check by having the new version present in output.
- found 0.19.0 with grep in /nix/store/c152az463594l2si39h4assahzv5wv6r-libraw-0.19.0
- directory tree listing: https://gist.github.com/d21a46bb80b662baa7febf18eab4e313
- du listing: https://gist.github.com/02a9d0af77dcf1045b4d3c5f7d17528f

libraw: 0.18.12 -> 0.19.0