Bug 1213721 - unbuffered python output during 'make upload', r=glandium

--HG--
extra : rebase_source : bc64f6d336d2f0a27bc9e1b31e93f254892d499a

toolkit/mozapps/installer/packager.mk

@@ -209,7 +209,7 @@ checksum:
 
 
 upload: checksum
-	$(PYTHON) $(MOZILLA_DIR)/build/upload.py --base-path $(DIST) \
+	$(PYTHON) -u $(MOZILLA_DIR)/build/upload.py --base-path $(DIST) \
 		--package $(PACKAGE) \
 		--properties-file $(DIST)/mach_build_properties.json \
 		$(UPLOAD_FILES) \