RFR JDK-8073924: Update test/java/nio/charset/Charset/NIOCharsetAvailability.java to work with module system

[Alan Bateman]

On 26/02/2015 22:09, Xueming Shen wrote:
>
> thanks! webrev has been updated accordingly.
One other tests that needs to be re-examined is 
test/sun/nio/cs/Test4200310.sh as it assumes rt.jar and charsets.jar 
too. In this case then it might be better to just remove it.

-Alan