wireguard: 0.0.20180519 -> 0.0.20180524 (#41031)

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

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

These checks were done:

- built on NixOS
- /nix/store/mr991d4pyvfng5bhh06kdlb29mj93cf3-wireguard-tools-0.0.20180524/bin/wg passed the binary check.
- /nix/store/mr991d4pyvfng5bhh06kdlb29mj93cf3-wireguard-tools-0.0.20180524/bin/wg-quick passed the binary check.
- 2 of 2 passed binary check by having a zero exit code.
- 0 of 2 passed binary check by having the new version present in output.
- found 0.0.20180524 with grep in /nix/store/mr991d4pyvfng5bhh06kdlb29mj93cf3-wireguard-tools-0.0.20180524
- directory tree listing: https://gist.github.com/52b47d18275b1b4550ccdd7bfdd16ef0
- du listing: https://gist.github.com/074aac4bf75c6a0a31e18b04cb0ffbc8