Make documentation targets available from the top-level makefile as well,

but not with separate object tree yet.

tools/Makefile-top.in

@@ -3,9 +3,12 @@
 
 objdir=@objdir@
 
-all depend tags docs userdocs progdocs install:
+all depend tags install:
 	$(MAKE) -C $(objdir) $@
 
+docs userdocs progdocs:
+	$(MAKE) -C doc $@
+
 clean:
 	$(MAKE) -C $(objdir) clean
 	find . -name "*~" -or -name "*.[oa]" -or -name "\#*\#" -or -name TAGS -or -name core -or -name depend -or -name ".#*" | xargs rm -f