exit on failure

[[Imported from SVN: r1995]]

am/webstuff

@@ -21,7 +21,7 @@ export BASEDIR
 web-install: all
 	if test -d $(DUNEWEBDIR) && test -r $(DUNEWEBDIR)/Make.global ; then \
 	  for DIR in $(SUBDIRS) ; do \
-	    $(MAKE) -C $$DIR web-install ; \
+	    $(MAKE) -C $$DIR web-install || exit 1; \
 	  done ; \
 	  $(MAKE) -f $(DUNEWEBDIR)/Make.global \
             EXTRAINSTALL="$(EXTRAINSTALL)" CURDIR="$(CURDIR)" install ; \