[jdk17u] RFR: 8275145: file.encoding system property has an incorrect value on Windows

[Naoto Sato]

This PR is for a backport of the subject fix to jdk17u. The fix for jdk18 was applied cleanly.

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Commit messages:
 - Backport ad9e234f5ed61635f926618a40f453fe7b6b491f

Changes: https://git.openjdk.java.net/jdk17u/pull/213/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u&pr=213&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8275145
  Stats: 9 lines in 1 file changed: 8 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk17u/pull/213.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u pull/213/head:pull/213

PR: https://git.openjdk.java.net/jdk17u/pull/213