[jdk17u-dev] RFR: 8280373: Update Xalan serializer / SystemIDResolver to align with JDK-8270492

[Matthias Baesken]

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

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Commit messages:
 - Backport c180070cb59b8e075376ae913c5db9a4ed868303

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/159/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=159&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8280373
  Stats: 5 lines in 1 file changed: 2 ins; 1 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/159.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/159/head:pull/159

PR: https://git.openjdk.java.net/jdk17u-dev/pull/159