Fix/CI failures#345
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GCC's initial `<filesystem>` (before version 9) shipped in a separate libstdc++fs and is unreliable: serializing a `std::filesystem::path` segfaults at runtime in CI. Exclude those versions from the availability guard so the feature is inert. Refs issue #337.
The wide *text* archive transcodes a narrow `std::string` through the stream locale's `codecvt_null`, which cannot represent bytes outside the ASCII range; it is the only archive in the test list that fails to round-trip non-ASCII content. The others preserve it: narrow text and XML store the bytes verbatim, binary stores them raw, and wide XML installs a UTF-8 codecvt. Rather than dropping the non-ASCII path from the test entirely, exercise it against every archive but the wide-text one.
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The example programs write to fixed temp filenames---demo and demo_exception even share tmpdir()/demofile.txt---so running them under `b2 -jN` with N > 1 races: concurrent processes clobber each other's archive files and a reader picks up a half-written one, throwing `archive_exception`. Therefore, run the examples under `-j1` (the tests keep running in parallel).
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