mwic: 0.7.4 -> 0.7.5

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

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

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 0.7.5 with grep in /nix/store/3r91cbyw9xi6iy67l5nalznb7rkq1idq-mwic-0.7.5
- directory tree listing: https://gist.github.com/0513e07e310449f5f9f06de443e90f43