RFR: 8349254: Disable "best-fit" mapping on Windows environment variables [v2]

[Naoto Sato]

> This is a follow-on fix to [JDK-8337506](https://bugs.openjdk.org/browse/JDK-8337506). The Java launcher can take arguments from "JDK_JAVA_OPTIONS" environment variable, so the same processing is needed. Also, obsolete code for Windows 9x has been removed.

Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:

  Reflects review

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23498/files
  - new: https://git.openjdk.org/jdk/pull/23498/files/48aa31a7..5a00388e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23498&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23498&range=00-01

  Stats: 12 lines in 1 file changed: 9 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/23498.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23498/head:pull/23498

PR: https://git.openjdk.org/jdk/pull/23498