message: Upgrade to xxHash 0.6.4.
diff: @@ -8,7 +8,7 @@ REPOSITORY_LOCATIONS = dict(
  remote = "https://github.com/bombela/backward-cpp",
  ),
  com_github_cyan4973_xxhash = dict(
  - commit = "50a564c33c36b3f0c83f027dd21c25cba2967c72", # v0.6.3
  + commit = "7caf8bd76440c75dfe1070d3acfbd7891aea8fca", # v0.6.4
  remote = "https://github.com/Cyan4973/xxHash",
  ),
  com_github_eile_tclap = dict(
  