Remove libu{} target group

The semantics provided by libu{} is rarely required and as result was not
yet documented. However, if you are using it, the new way to achieve the
same result is to use both libue{} and libul{} explicitly, for example:

exe{foo}: libue{foo}
lib{foo}: libul{foo}

{libue libul}{foo}: cxx{*}

1 files changed, 12 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index f9b71be..1a2f5a7 100644
--- a/NEWS
+++ b/NEWS
@@ -12,6 +12,18 @@ Version 0.12.0
     LIBBUILD2_ATOMIC_NON_LOCK_FREE
 
 
+  * The libu{} target group has been removed.
+
+    The semantics provided by libu{} is rarely required and as result was not
+    yet documented. However, if you are using it, the new way to achieve the
+    same result is to use both libue{} and libul{} explicitly, for example:
+
+    exe{foo}: libue{foo}
+    lib{foo}: libul{foo}
+
+    {libue libul}{foo}: cxx{*}
+
+
 Version 0.11.0
 
   * Initial work on header unit importation and include translation support.