ChangeLog: mention STARPU_NCPU.

ChangeLog

@@ -25,6 +25,10 @@ New features:
 Changes:
   * The FxT code can now be used on systems other than Linux.
 
+Small changes:
+  * STARPU_NCPU should now be used instead of STARPU_NCPUS. STARPU_NCPUS is
+	still available for compatibility reasons.
+
 StarPU 1.0.0 (svn revision 6306)
 ==============================================
 The extensions-again release