folly: 2018.05.28.00 -> 2018.06.11.00 (#42014)

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

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

These checks were done:

- built on NixOS

- 0 of 0 passed binary check by having a zero exit code.
- 0 of 0 passed binary check by having the new version present in output.
- found 2018.06.11.00 with grep in /nix/store/3x7mc1n99r135i68xrax71bqcxpk6cbs-folly-2018.06.11.00
- directory tree listing: https://gist.github.com/cd02bb388dc7ae5c5b39289c8d8b3dc9
- du listing: https://gist.github.com/87c16407b769dd56c0d14d59d577da32