collectd: remove the patch scaling ping_droprate from 0-1 to 0-100

Upstream project's behaviour of reporting this data source in range 0-1
is used by at least CentOS 7 collectd 5.8.1, very likely the same
behaviour is also in widely use by other distributions.

The change is important for providing consistent experience across
collectd deployments on different environments

Ref: https://github.com/collectd/collectd/pull/3244
Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
(cherry picked from commit 2f66fa5c23)
Ref: https://github.com/openwrt/luci/issues/3308

utils/collectd/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=collectd
 PKG_VERSION:=5.9.0
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:=https://collectd.org/files/ \

utils/collectd/patches/920-fix-ping-droprate.patch

@@ -1,11 +0,0 @@
---- a/src/ping.c
-+++ b/src/ping.c
-@@ -648,7 +648,7 @@ static int ping_read(void) /* {{{ */
-                             ((double)(pkg_recv * (pkg_recv - 1))));
- 
-     /* Calculate drop rate. */
--    droprate = ((double)(pkg_sent - pkg_recv)) / ((double)pkg_sent);
-+    droprate = ((double)(pkg_sent - pkg_recv)) * 100 / ((double)pkg_sent);
- 
-     submit(hl->host, "ping", latency_average);
-     submit(hl->host, "ping_stddev", latency_stddev);