RFR: 8213618 IBM970 charset has missing entry and remove unexpected entries

[Ichiroh Takiguchi]

Hello.

Could you review the fix ?

Bug:    https://bugs.openjdk.java.net/browse/JDK-8213618
Change: http://cr.openjdk.java.net/~itakiguchi/8213618/webrev.00/

I'd like to obtain a sponsor for this issue.

Thanks,
Ichiroh Takiguchi
IBM Japan, Ltd.