Support @argument files in the Java binary wrapper script

[cushon]

Related: #6354

JDK 9 adds support for flag files using the @argument-file syntax, see "java Command-Line Argument Files" in https://docs.oracle.com/javase/9/tools/java.htm.

We could back-fill support for that syntax for older --javabase versions by adding logic to the wrapper script.

[regisd]

@cushon Duplicate of #6354 ?

[cushon]

Not quite: #6354 is about adding the feature that was adding in JDK 9, this is about implementing that feature with logic in the wrapper script to support it on older JDKs.

[lberki]

I'll close this one in favor of #6354 and add the information in the description of this one there.