HADOOP-10925. Change attribution in CHANGES.txt from trunk to 2.6.0.

(cherry picked from commit 3e8f353c8e36b1467af4a8a421097afa512b324c)

Conflicts:
	hadoop-common-project/hadoop-common/CHANGES.txt

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -436,6 +436,9 @@ Release 2.6.0 - UNRELEASED
     HADOOP-11071. KMSClientProvider should drain the local generated EEK cache
     on key rollover. (tucu)
 
+    HADOOP-10925. Compilation fails in native link0 function on Windows.
+    (cnauroth)
+
 Release 2.5.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES