Builds fail due to use of preview features & removed arguments

[Maurizio Cimadamore]

On 19/12/2019 23:42, Ty Young wrote:
> Regardless, it still errors on the foreign-jextract branch as well.

I already replied here:

https://mail.openjdk.java.net/pipermail/panama-dev/2019-December/006891.html

As the branch does not contain any changes compared to jdk/jdk, no 
additional build configuration parameter is supported.

Maurizio