smartmontools: remove stale dependency on rsync

rsync is in no way related to smartmontools. Additionally rsync
is missing in the new github repo.

Signed-off-by: Stefan Hellermann <stefan@the2masters.de>

utils/smartmontools/Makefile

@@ -41,7 +41,6 @@ endef
 
 define Package/smartd
   $(call Package/smartmontools/Default)
-  DEPENDS+= +rsync
   TITLE+= Daemon
 endef