This vendor security fix, was part of 2.5.3 and later.

So we don't need it anymore.

net/rsync/files/patch-clientserver.c

@@ -1,27 +0,0 @@
---- clientserver.c	7 Feb 2002 16:36:12 -0000	1.82
-+++ clientserver.c	21 Feb 2002 00:45:48 -0000	1.86
-@@ -282,6 +285,24 @@
- 	}
- 
- 	if (am_root) {
-+		/* Get rid of any supplementary groups this process
-+		 * might have inheristed. */
-+		if (setgroups(0, NULL)) {
-+			rsyserr(FERROR, errno, "setgroups failed");
-+			io_printf(fd, "@ERROR: setgroups failed\n");
-+			return -1;
-+		}
-+
-+		/* XXXX: You could argue that if the daemon is started
-+		 * by a non-root user and they explicitly specify a
-+		 * gid, then we should try to change to that gid --
-+		 * this could be possible if it's already in their
-+		 * supplementary groups. */
-+
-+		/* TODO: Perhaps we need to document that if rsyncd is
-+		 * started by somebody other than root it will inherit
-+		 * all their supplementary groups. */
-+
- 		if (setgid(gid)) {
- 			rsyserr(FERROR, errno, "setgid %d failed", (int) gid);
- 			io_printf(fd,"@ERROR: setgid failed\n");