Tune the clean-l usage

- Fix the doc/ clean target which was called clean-local
 - Consistently use $(RM)
 - Introduce CLEAN variable to make it simpler to costumize local cleaning

Makefile

@@ -4,9 +4,6 @@ include $(path_to_top)/Makefile.config
 # TODO: Automagically rerun autoconf.
 
 SUBDIRS = doc po src
-
-
-clean-l:
-	rm -rf features.log
+CLEAN	= features.log
 
 include $(path_to_top)/Makefile.lib

Makefile.lib

@@ -59,8 +59,10 @@ endif
 	$(call cmd,archive)
 
 ifdef OBJS
+CLEAN += $(OBJS)
+
 clean-l:
-	rm -f $(OBJS) *.a
+	$(RM) $(CLEAN) *.a
 endif
 
 
@@ -81,5 +83,4 @@ all-l:
 install-l:
 clean-l:
 
-
 # vim:syntax=make

doc/Makefile

@@ -129,7 +129,7 @@ doc-dirs:
 	$(INSTALL) -d $(DOC_DIRS)
 
 # $(MAN_DIR) intentionally left out
-clean-local:
+clean-l:
 	$(RM) -r $(HTML_DIR) $(XML_DIR) $(TXT_DIR) $(PDF_DIR) *.tmp