RFR: 7903515: Some default env vars on Windows not set [v2]

[Christian Stein]

> Please review this change to fix setting of some default environment variables on Windows.

Christian Stein has updated the pull request incrementally with one additional commit since the last revision:

  Remove `CaseInsensitive` from method name

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Changes:
  - all: https://git.openjdk.org/jtreg/pull/166/files
  - new: https://git.openjdk.org/jtreg/pull/166/files/5580fb2d..f06ce0d2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jtreg&pr=166&range=01
 - incr: https://webrevs.openjdk.org/?repo=jtreg&pr=166&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jtreg/pull/166.diff
  Fetch: git fetch https://git.openjdk.org/jtreg.git pull/166/head:pull/166

PR: https://git.openjdk.org/jtreg/pull/166