git: openjdk/jdk15u-dev: 8280373: Update Xalan serializer / SystemIDResolver to align with JDK-8270492

[Olga Mikhaltsova]

Changeset: 6ea7ef60
Author:    Olga Mikhaltsova <omikhaltcova at openjdk.org>
Date:      2022-02-04 07:40:34 +0000
URL:       https://git.openjdk.java.net/jdk15u-dev/commit/6ea7ef60d92de20e312837a1fe8fd6279a0e37af

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

Backport-of: c180070cb59b8e075376ae913c5db9a4ed868303

! src/java.xml/share/classes/com/sun/org/apache/xml/internal/serializer/utils/SystemIDResolver.java