RFR: JDK-8280373: Update Xalan serializer / SystemIDResolver to align with JDK-8270492

[Joe Wang]

On Thu, 20 Jan 2022 10:55:59 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> After 8270492
> https://github.com/openjdk/jdk/commit/78b2c8419bc69436873e6fc9c542480949d140c5
> has been pushed, we should adjust src/java.xml/share/classes/com/sun/org/apache/xml/internal/serializer/utils/SystemIDResolver.java getAbsoluteURI to what has been done in 8270492 to src/java.xml/share/classes/com/sun/org/apache/xml/internal/utils/SystemIDResolver.java

Thanks Alan for the reminder. The change looks good. Please add a copyright header and the LastModified tag as the other class did.

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PR: https://git.openjdk.java.net/jdk/pull/7155