add support for VKI_BLKDISCARDZEROES

this is used in some newer QEMU versions and other tools


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14235 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/NEWS b/NEWS
index bdf4965..01e985d 100644
--- a/NEWS
+++ b/NEWS
@@ -209,6 +209,7 @@
 n-i-bz  Fix mingw64 support in valgrind.h (dev@, 9 May 2014)
 n-i-bz  drd manual: Document how to C++11 programs that use class "std::thread"
 n-i-bz  Add command-line option --default-suppressions
+n-i-bz  Add support for BLKDISCARDZEROES ioctl
 
 
 Release 3.9.0 (31 October 2013)