busybox wget does not know tries

mk/vars.mk

@@ -140,6 +140,6 @@ QUIET:=
 else
 QUIET:=			--quiet
 endif
-FETCH_CMD?=		wget --tries=1 --timeout=30 $(QUIET)
+FETCH_CMD?=		wget --timeout=30 $(QUIET)
 
 include $(TOPDIR)/mk/mirrors.mk