openvswitch: use released version 2.4.0

The previous version was an unreleased one from the OVS trunk.
This one is the released version, described here:
  http://openvswitch.org/pipermail/announce/2015-August/000078.html

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

net/openvswitch/Makefile

@@ -11,7 +11,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=openvswitch
 
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_VERSION:=2.4.0
 PKG_RELEASE=$(PKG_SOURCE_VERSION)
 PKG_LICENSE:=Apache-2.0
@@ -21,7 +21,7 @@ PKG_USE_MIPS16:=0
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://github.com/openvswitch/ovs
 PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
-PKG_SOURCE_VERSION:=1b05a9d3298f92525d1c2d91bec11abf0766fdf1
+PKG_SOURCE_VERSION:=b979c282ef040a20d09b8d6885648b09352f05db
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.gz
 
 PKG_BUILD_PARALLEL:=1