Vendored third-party code for lrstat
--------------------------------------

1) ska::flat_hash_map (header-only)
   - Upstream URL: https://github.com/skarupke/flat_hash_map
   - Vendored path in this package: src/ska/flat_hash_map.hpp
   - Upstream commit/sha: 2c4687431f978f02a3780e24b8b701d22aa32d9c
   - Raw file URL at that commit:
     https://github.com/skarupke/flat_hash_map/commit/2c4687431f978f02a3780e24b8b701d22aa32d9c
   - License: Boost Software License 1.0 (see LICENSE-ska-flat_hash_map)
   - Copyright: Malte Skarupke 2017

Notes:
- The header is vendored to avoid external dependencies during CRAN builds.
- The original copyright and license header in the vendored header file are preserved verbatim.
