Build the MAR file by packaging dist/$(MOZ_PKG_APPNAME) instead of dist/bin

as that location has been tailored to for distribution.  a=asa

tools/update-packaging/Makefile.in

@@ -43,11 +43,13 @@ VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
+include $(topsrcdir)/toolkit/mozapps/installer/package-name.mk
+
 # Default output location for update archive
 STAGE_DIR	= $(DIST)/update
 
 full-update::
 	mkdir -p $(STAGE_DIR)
-	MAR=$(DIST)/host/bin/mar $(srcdir)/make_full_update.sh $(STAGE_DIR)/update.mar $(DIST)/bin
+	MAR=$(DIST)/host/bin/mar $(srcdir)/make_full_update.sh $(STAGE_DIR)/update.mar $(DIST)/$(MOZ_PKG_APPNAME)
 
 include $(topsrcdir)/config/rules.mk