test: No need for weak in 'make test'

Makefile

@@ -51,7 +51,7 @@ distclean:
 	-rm -rf node node_g blog.html email.md
 	-rm -rf node_modules
 
-test: all node_modules/weak
+test: all
 	$(PYTHON) tools/test.py --mode=release simple message
 	PYTHONPATH=tools/closure_linter/ $(PYTHON) tools/closure_linter/closure_linter/gjslint.py --unix_mode --strict --nojsdoc -r lib/ -r src/ --exclude_files lib/punycode.js