For some reason these files would get marked as modified
just after a fresh clone on Linux

mod_prefix is an in-memory data store optimized for fast lookups
according to the longest prefix match (LPM) rule.

Tables of key-value string pairs in JSON format can be loaded at
startup via configuration and at runtime via the API.

The implementation uses a bitwise trie (aka binary prefix tree), so
arbitrary string keys are supported.

This should help improve the autocrlf issue in Windows.

Without libjs in tree, this can't realistically be built.  Our legacy
is stored in the version control history.

we have already removed the module from tree, no need to bootstrap/configure the lib still, or to have it in tree at all for that matter

* commit 'e3b0d721':
  Fix BLF confusion when dealing with the same extension in multiple domains