<i18n dev> RFR: 8285838: DST not applying properly with zone id offset set with TZ env variable

[Gaurav Chaudhari]

This fix ensures that when a lookup for a custom TZ code fails, and an attempt is made to find the GMT offset in order to get the current time, Daylight savings rules are applied correctly.

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Commit messages:
 - 8285838: Fix for TZ environment variable DST rules

Changes: https://git.openjdk.java.net/jdk/pull/8661/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8661&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8285838
  Stats: 139 lines in 3 files changed: 138 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8661.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8661/head:pull/8661

PR: https://git.openjdk.java.net/jdk/pull/8661