RFR: Update java/nio/charset/Charset/NIOCharsetAvailabilityTest.java to eliminate dependency on sun.misc.Launcher

[Alan Bateman]

On 01/12/2014 07:55, Amy Lu wrote:
> Yes, the extensions part should be removed.
>
> Please review the updated version: 
> http://cr.openjdk.java.net/~weijun/8066131/webrev.01
This looks okay for now and I can sponsor this for you. We might have to 
come back to this test later in JDK 9.

-Alan