build: quiet the exe-installer output

Makefile.am

@@ -59,8 +59,9 @@ $(BITCOIN_WIN_INSTALLER): all-recursive
 	STRIPPROG="$(STRIP)" $(INSTALL_STRIP_PROGRAM) $(BITCOIND_BIN) $(top_builddir)/release
 	STRIPPROG="$(STRIP)" $(INSTALL_STRIP_PROGRAM) $(BITCOIN_QT_BIN) $(top_builddir)/release
 	STRIPPROG="$(STRIP)" $(INSTALL_STRIP_PROGRAM) $(BITCOIN_CLI_BIN) $(top_builddir)/release
-	@test -f $(MAKENSIS) && $(MAKENSIS) $(top_builddir)/share/setup.nsi || \
+	@test -f $(MAKENSIS) && $(MAKENSIS) -V2 $(top_builddir)/share/setup.nsi || \
 	  echo error: could not build $@
+	@echo built $@
 
 $(if $(findstring src/,$(MAKECMDGOALS)),$(MAKECMDGOALS), none): FORCE
 	$(MAKE) -C src $(patsubst src/%,%,$@)