new(librsync.github.io): rdiff + librsync (rsync remote-delta algorithm)#13114
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LGPL-2.1+ library implementing the rsync rolling-checksum delta algorithm (signature/delta/patch), plus the `rdiff` reference CLI used for librsync interop. CMake build, depends on rpm.org/popt at runtime.
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Adds librsync, the LGPL-2.1+ library that implements the rsync rolling-checksum delta algorithm (signature / delta / patch). Ships the `rdiff` reference CLI, which is the canonical interop target for any rsync-style delta tooling.
CMake build; runtime dep `rpm.org/popt` for CLI option parsing.
Built and tested locally (darwin/aarch64); the test round-trips a 64 KiB random basis through `rdiff signature` → `rdiff delta` → `rdiff patch` and `cmp`s the result.
Refs: librsync/librsync @ v2.3.4, homebrew/librsync.