Alexey Dokuchaev 84ba2383e7 games/openenroth: unbreak the port's build in pre-C++20 environments ... Pull Clang 13 when it's not available in the base (via USES+=llvm:13) and use Boost's ``unordered_map'' implementation while the system one is insufficient; avoid ``std::u8string'' for the same reason. Set LLD_UNSAFE to unbreak linking against OpenAL on i386 (ld: error: cannot preempt symbol: alGetError). While here, slightly wordsmith the installation message. Reported by: pkg-fallout		2023-02-04 15:10:00 +00:00
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