Allow long non-file arguments to be spilled

[novalis]

Allow long non-file arguments (e.g. -classpath) to go to a file. This
prevents E2BIG when the classpath argument is too long.

This can't easily be fixed in upstream ant because:
(a) it would require an API change, and
(b) there is no way for ant to know which arguments are safe to spill
as that depends on the semantics of the external compiler.

[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

📝 Please visit https://cla.developers.google.com/ to sign.

Once you've signed, please reply here (e.g. I signed it!) and we'll verify. Thanks.

---

• If you've already signed a CLA, it's possible we don't have your GitHub username or you're using a different email address. Check your existing CLA data and verify that your email is set on your git commits.
• If your company signed a CLA, they designated a Point of Contact who decides which employees are authorized to participate. You may need to contact the Point of Contact for your company and ask to be added to the group of authorized contributors. If you don't know who your Point of Contact is, direct the project maintainer to go/cla#troubleshoot.
• In order to pass this check, please resolve this problem and have the pull request author add another comment and the bot will run again.

[novalis]

My company has signed the corporate CLA, and @googlebot has in the past gotten this correct -- see e.g. google/google-java-format#163

[novalis]

Oh, hm, maybe it was because I wasn't part of the Two Sigma group on github yet? Let me retry...

[novalis]

I signed it!

[novalis]

Our Google accounts were messed up, and I think are now fixed, so maybe if I retry now the CLA-bot will work?

[googlebot]

CLAs look good, thanks!

[novalis]

Just a ping on this. Thanks.