folly/io:compression: add LZMA2 support
Summary: Adds LZMA2 and LZMA2_VARINT_SIZE compression support for folly::io::Compression. This format shows some big wins for compressing ELF object files and is useful in our modified ccache client. Test Plan: Compression unittests. Also, tested compressing object files built in fbcode. On average, the compression percentage improved from ~16.5% to ~12%. But we save a lot more as object files get bigger, which can help make bigger object files fit over fewer memcache keys. Reviewed By: njormrod@fb.com FB internal diff: D1092576
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