[externals] use ankerl::unordered_dense over std and tsl #5162
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ankerl::unordered_dense is faster on average and has less memory usage
than both std::unordered_map and tsl::robin_map. It's also seemingly
better maintained, and shouldn't need an extra patch on top of upstream--this has the added benefit of allowing users to use the system unordered_dense package, which I'm sure the Gentoo packagers will appreciate. Plus it will complement #5159 nicely :)
Obviously, this will need a lot of testing.
Signed-off-by: crueter [email protected]