package/rsync: link with -latomic if needed

Fixes:
http://autobuild.buildroot.net/results/9eb9a92871622472b8f9eb3797aadd3651fc78a4/

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit b9a062b354953f3fbfee702bb5b5007598299925)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/rsync/rsync.mk

@@ -24,6 +24,10 @@ RSYNC_CONF_OPTS = \
 	--disable-lz4 \
 	--disable-md5-asm
 
+ifeq ($(BR2_TOOLCHAIN_HAS_LIBATOMIC),y)
+RSYNC_CONF_ENV += LIBS=-latomic
+endif
+
 ifeq ($(BR2_PACKAGE_ACL),y)
 RSYNC_DEPENDENCIES += acl
 else