Merge loops.

* This improves resiliency to changes in project directory changes too.

include/Makefile.am

@@ -67,11 +67,8 @@ distclean-local:
 	@for d in $(SUBDIRS); do \
 		dd=$$d/$(DEPDIR) ; test ! -d $$dd \
 			|| (rm -f $$dd/FC.dep* ; rmdir $$dd) ; \
-		test "$(abs_builddir)" = "$(abs_srcdir)" -o $$d = . \
-			|| rmdir $$d ; done
-	@if test "$(abs_builddir)" != "$(abs_srcdir)" ; then \
-		for d in core ppm; do \
-		test $$d = . || rmdir $$d ; done ; fi
+		test "$(abs_builddir)" = "$(abs_srcdir)" \
+			-o $$d = . -o ! -d $$d || rmdir $$d ; done
 
 dist-hook:
 	-rmdir $(distdir)/core $(distdir)/ppm