[m-rev.] for post-commit review: update 22.01.5 NEWS file

[Julien Fischer]

Update 22.01.5 NEWS file.

NEWS:
     Mention the recent fix for transitive intermodule optimization
     dependencies.

Julien.

diff --git a/NEWS b/NEWS
index 913abd3..9966741 100644
--- a/NEWS
+++ b/NEWS
@@ -972,6 +972,9 @@ This is a bug-fix release.
  * We have fixed a bug with the MLDS backend that was causing
    crashes with certain switches on strings.

+* We have fixed a bug that was causing some transitive intermodule
+  optimization interfaces to be silently ignored.
+
  NEWS for Mercury 22.01.4
  ========================