[ng] subdirs: merge $(RECURSIVE_CLEAN_TARGETS) into $(RECURSIVE_TARGETS)

* lib/am/subdirs.mk: Here.  They had once been separated for historical
reasons, but such separation is not needed anymore today.
* NG-NEWS: Update.

Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>

2 files changed, 12 insertions, 4 deletions

diff --git a/NG-NEWS b/NG-NEWS
index e953f5206..7d3bc757e 100644
--- a/NG-NEWS
+++ b/NG-NEWS
@@ -295,6 +295,10 @@ Obsolete Features Removed
   missing the relevant maintainer-specific tools (or having too old
   versions thereof).
 
+* The $(RECURSIVE_CLEAN_TARGETS) variable (never documented, and
+  always intended to be an internal detail) has been removed, its
+  content merged into the $(RECURSIVE_TARGETS) variable.
+
 
 Source Files with Unknown Extensions
 ====================================
diff --git a/lib/am/subdirs.mk b/lib/am/subdirs.mk
index 1d39596f1..9e70000e3 100644
--- a/lib/am/subdirs.mk
+++ b/lib/am/subdirs.mk
@@ -14,13 +14,17 @@
 ## You should have received a copy of the GNU General Public License
 ## along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-RECURSIVE_TARGETS += all-recursive check-recursive installcheck-recursive
-RECURSIVE_CLEAN_TARGETS = mostlyclean-recursive clean-recursive	\
-  distclean-recursive maintainer-clean-recursive
+RECURSIVE_TARGETS += \
+  all-recursive \
+  check-recursive \
+  installcheck-recursive \
+  mostlyclean-recursive \
+  clean-recursive \
+  distclean-recursive \
+  maintainer-clean-recursive
 
 am.recurs.all-targets = \
   $(RECURSIVE_TARGETS) \
-  $(RECURSIVE_CLEAN_TARGETS) \
   $(am.recurs.extra-targets)
 
 # All documented targets which invoke 'make' recursively, or depend