Fix the syntax error on declaration of `addFile()`

[janza]

Fixes #928

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[jrburke]

Looks like it is old 0.10 and 0.12 versions of node that report this problem, versions 4-6 report to be fine, according to reports in requirejs/requirejs#1583

I will use this ticket to track the final fix. I'll want to do a bit more than what is done in this pull request since this js file is generated by a script, but I should have a fix up within the day.

[jrburke]

Thank you for the fix. I committed a change that does the equivalent in the script that generates that file. Version 2.3.1 has been released with the fix now.

[janza]

Great, thanks for the fix!