Revert "librsync: drop recipe"

This reverts commit 9dafa732ed74bc0b71ec33cb79e317ed056a64da.

librsync is available since dunfell in OE, let this in thud

Signed-off-by: Stefano Babic <sbabic@denx.de>

recipes-support/librsync/librsync_2.1.0.bb

@@ -0,0 +1,22 @@
+SUMMARY = "librsync is a library for calculating and applying network deltas, \
+with an interface designed to ease integration into diverse network applications."
+HOMEPAGE = "http://librsync.sourceforge.net"
+
+SECTION = "libs"
+
+LICENSE = "LGPLv2.1"
+LIC_FILES_CHKSUM = "file://COPYING;md5=d8045f3b8f929c1cb29a1e3fd737b499 \
+                    file://debian/copyright;md5=365dc7c8a0d1b88cfc01021bcc5d2a30"
+
+SRC_URI = "git://github.com/librsync/librsync.git;protocol=https"
+
+PV = "2.1.0+git${SRCPV}"
+SRCREV = "ac2274f562e74578b533ee734c8dada1aa5d93dc"
+
+S = "${WORKDIR}/git"
+
+DEPENDS = "bzip2 zlib"
+inherit cmake
+
+# Specify any options you want to pass to cmake using EXTRA_OECMAKE:
+EXTRA_OECMAKE = ""