RFC: nashorn sources are missing in src.zip

[Jiri Vanek]

https://jvanek.fedorapeople.org/oracle/jdk8/webrevs/nashornMissingInSrcZip/v1/webrev/

Hello good people!

I have found, that nashorn sources are missing in src.zip.
It is easily fixable by webrev above.

If you will think about it as "private api",  jdk9 *have* nashorn module sources included.

Actually more sun* sources are missing. Or even more sources which result to ext directory. Imho 
they should be included too. I will prepare patches for each set separately, if it will be agreed.

I know that sun* are somehow deprecated. But it is sad when you can not easily debug inside the JDK. 
The absence of theirs in src.zip is not the cure.

Thanx!
   J.