Ryan Scott authored May 17, 2019 and Herbert Valerio Riedel committed May 18, 2019

* Add patches for `HsYAML`, `bencode`, `inline-c`, `pandoc`,
  `regex-pcre-builtin`, `skylighting-core`, `texmath`, and
  `xml-hamlet`.
* Migrate the `hedgehog` patch to the latest Hackage version.
* Remove the old `shake` patch. The latest version on Hackage now
  builds with GHC 8.8.
* Patch `generic-lens` to work around kcsongor/generic-lens#84.
* The `vinyl` patch is only guarded against GHC 8.9 or later, but
  there is no reason for it not to also apply to GHC 8.8. Indeed,
  `vinyl` fails to build on 8.8 unless this is done.