[source] iperf: used an updated renamed tarball instead of main upstream URL

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/be7f2abb60db79a7430576d45e20339c56e88c05

commit be7f2abb60db79a7430576d45e20339c56e88c05
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Mon Oct 17 11:16:30 2016 +0200

    iperf: used an updated renamed tarball instead of main upstream URL
    
    iperf upstream added some bugfixes to the already released 2.0.9 version
    without changing the filename. This conflicts with old mirrored files
    and the hash that we previously used.
    To avoid conflict, use a renamed tarball from mirror2.openwrt.org
    containing the new upstream changes
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 package/network/utils/iperf/Makefile | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/package/network/utils/iperf/Makefile b/package/network/utils/iperf/Makefile
index c47830c..b17ed0f 100644
--- a/package/network/utils/iperf/Makefile
+++ b/package/network/utils/iperf/Makefile
@@ -9,11 +9,16 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=iperf
 PKG_VERSION:=2.0.9
+PKG_VERSION_SUFFIX:=a
 PKG_RELEASE:=1
 
-PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
-PKG_SOURCE_URL:=@SF/iperf2
-PKG_MD5SUM:=1bb3a1d98b1973aee6e8f171933c0f61
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)$(PKG_VERSION_SUFFIX).tar.gz
+# Temporary URL change - iperf upstream altered the already released target
+# without bumping the version number. The new tarball is renamed to avoid
+# conflicts with existing mirrored files.
+# PKG_SOURCE_URL:=@SF/iperf2
+PKG_SOURCE_URL:=http://mirror2.openwrt.org/sources
+PKG_MD5SUM:=db02911f35686e808ed247160dfa766e08ae3f59d1e7dcedef0ffb2a6643f0bf
 
 PKG_MAINTAINER:=Felix Fietkau <nbd at nbd.name>
 PKG_LICENSE:=BSD-3-Clause