Enable the IDL attribute checker in run-bindings-tests

Enable the IDL attribute checker in run-bindings-tests
https://bugs.webkit.org/show_bug.cgi?id=79091

Reviewed by Adam Barth.

We have enabled the IDL attribute checker in Chromium in r108322.
This patch enables the IDL attribute checker in run-bindings-tests.

No tests. I manually checked that [Custommm], [CallWith=],
[CallWith=ScriptExecutionContext|Foo] in TestObj.idl cause
run-bindings-tests failures.

* Scripts/webkitpy/bindings/main.py:
(BindingsTests.generate_supplemental_dependency):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@108400 268f45cc-cd09-0410-ab3c-d52691b4dbfc