Add x-IBM-1129 charset

[Alan Bateman]

On 25/07/2018 11:52, Nasser Ebrahim wrote:
> Hello,
>
> I had kept aside this discussion for a while as there is a parallel
> discussion on whether to move the IBM charsets on openjdk  to a different
> location or outside JDK[
> http://mail.openjdk.java.net/pipermail/core-libs-dev/2018-July/054248.html
> ]. From that discussion, it is confirmed that the charsets in java.base
> will not be impacted irrespective the IBM charsets are moved to a new
> location or removed from openjdk. Hence, I believe we can proceed with
> this new charset as it requires to be in the java.base for AIX platform.
and to be clear, I think what you are doing here is adding IBM-1129 to 
java.base on AIX builds and adding it to jdk.charsets on other 
platforms. There isn't any build infrastructure at this time to do 
otherwise and maybe that is something that will come out of the other 
discussion thread.

-Alan