Bug#916145: closure-compiler: Not working with recent JS code

[Chris Hofstaedtler]

* Roland Gruber <post at rolandgruber.de> [190406 16:07]:
> the current version is so old that it got incompatible with recent JS code.
> E.g. jQuery 3.3.1 cannot be minified as the tool reports parsing errors.
> 
> Please either update the tool or remove it from the archive. This is now
> 5 years in unmaintained state.

I've checked all r-deps of closure-compiler in Debian, and they all
build -- datatables-extensions shows some errors in a prebuilt file,
but it has done so for a long time, so probably not super relevant.

While I agree that having a 5 year old JS compiler in Debian is not
a great situation, its also not threatening to the packages in
Debian using it, so I'd suggest keeping it for now.
Adrian: you raised the severity, care to lower it until buster is
out (or say some words on why)?

Cheers,
Chris (from the Salzburg BSP)