[COMMITTED] NEWS: Update with removal of dumped heaps

[Wilco Dijkstra]

Support for dumped heaps has been removed - malloc_set_state() now always
returns the error code -1.

---

diff --git a/NEWS b/NEWS
index 1b115d376cf6c94d2bcd1fcb2c478a54f0b729e3..9831f7f5d460f53773b4b25512c38c7b883e889f 100644
--- a/NEWS
+++ b/NEWS
@@ -13,7 +13,8 @@ Major new features:
 
 Deprecated and removed features, and other changes affecting compatibility:
 
-  [Add deprecations, removals and changes affecting compatibility here]
+* Support for dumped heaps has been removed - malloc_set_state() now always
+  returns the error code -1.
 
 Changes to build and runtime requirements: