librsync: upgrade 2.3.0 -> 2.3.1
This is a patch release that adds peformance improvements, updates and
tidies documentation, and fixes two build/test bugs.
See full changelog https://github.com/librsync/librsync/releases/tag/v2.3.1
Signed-off-by: Pierre-Jean Texier <pjtexier@koncepto.io>
Signed-off-by: Khem Raj <raj.khem@gmail.com>